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Background: Prescribing repetitions relative to task-failure is an emerging approach to resistance training. Under this approach, participants terminate the set based on their prediction of the remaining repetitions left to task-failure. While this approach holds promise, an important step in its development is to determine how accurate participants are in their predictions. That is, what is the difference between the predicted and actual number of repetitions remaining to task-failure, which ideally should be as small as possible. Objective: Examine the accuracy in predicting repetitions to task-failure in resistance exercises. Design: Scoping review and exploratory meta-analysis. Search and Inclusion: A systematic literature search was conducted with PubMed, SPORTDiscus, and Google Scholar in January 2021. Inclusion criteria included studies with healthy participants who predicted the number of repetitions they can complete to task-failure in various resistance exercises, before or during an ongoing set, which was performed to task-failure. Sixteen publications were eligible for inclusion, of which 13 publications that cover 12 studies were included in our meta-analysis with a total of 414 participants. Results: The main multilevel meta-analysis model including all effects sizes (262 across 12 clusters) revealed that participants tended to under predict the number of repetitions to task-failure by 0.95 repetitions (95% CIs= 0.17 to 1.73), but with considerable heterogeneity (Q(261)= 3060, p< 0.0001; I2 = 97.9%). Meta-regressions showed that prediction accuracy slightly improved when the predictions were made closer to set failure (β= -0.025 [95% CIs= -0.05 to 0.0014]) and when the number of performed to task-failure was lower (12 repetitions, β= 0.47 [95%CIs= 0.44 to 0.49]). Set number trivially influenced prediction accuracy with slightly increased accuracy in later sets (β= -0.07 repetitions [95% CIs= -0.14 to -0.005]). In contrast, participants training status did not seem to influence prediction accuracy (β= -0.006 repetitions [95% CIs= -0.02 to 0.007]) and neither did the implementation of upper or lower body exercises (Upper body – Lower body = -0.58 repetitions [95% CIs -2.32 to 1.16]). Further, there was minimal between participant variation in predictive accuracy (standard deviation = 1.45 repetitions [95% CIs = 0.99 to 2.12]). Conclusions: Participants were imperfect in their ability to predict proximity to task-failure independent of their training background. It remains to be determined whether the observed degree of inaccuracy should be considered acceptable. Despite this, prediction accuracies can be improved if they are provided closer to task-failure, when using heavier loads, or in later sets. To reduce the heterogeneity between studies, future studies should include a clear and detailed account of how task-failure was explained to participants and how it was confirmed.

The average environmental and occupational physiologist may find statistics are difficult to interpret and use since their formal training in statistics is limited. Unfortunately, poor statistical practices can generate erroneous or at least misleading results and distorts the evidence in the scientific literature. These problems are exacerbated when statistics are used as thoughtless ritual that is performed after the data are collected. The situation is worsened when statistics are then treated as strict judgements about the data (i.e., significant versus non-significant) without a thought given to how these statistics were calculated or their practical meaning. We propose that researchers should consider statistics at every step of the research process whether that be the designing of experiments, collecting data, analysing the data or disseminating the results. When statistics are considered as an integral part of the research process, from start to finish, several problematic practices can be mitigated. Further, proper practices in disseminating the results of a study can greatly improve the quality of the literature. Within this review, we have included a number of reminders and statistical questions researchers should answer throughout the scientific process. Rather than treat statistics as a strict rule following procedure we hope that readers will use this review to stimulate a discussion around their current practices and attempt to improve them. The code to reproduce all analyses and figures within the manuscript can be found at https:// http://doi.org/10.17605/OSF.IO/BQGDH

Purpose. The present study aimed to explore the associations between parents’ physical activity (PA) and sedentary behaviors (SED) and their explicit and implicit attitudes towards these behaviors and their children’s PA and SED, and attitudes. Children’s and parents’ age and gender were taken into account. Method. One hundred and seven dyads composed of one parent (Mage = 42.9 years) and her/his child (Mage = 11.6 years) completed questionnaires assessing behaviors and explicit attitudes towards PA and SED. Implicit attitudes were evaluated with an Implicit Association Test. Results. Parents’ PA was positively correlated with their children’s PA. No significant correlation was noted for SED, implicit and explicit attitudes. Results from hierarchical regression analyses showed that children’s explicit attitudes towards PA were negatively associated with parents’ SED. Except for an unexpected result (i.e., children’s implicit attitudes were positively associated with parents’ explicit attitudes towards PA), no other association was found. Conclusion(s). This study is the first to investigate the association between parents’ and their children’s implicit and explicit attitudes towards PA and SED. The results indicate that focusing on the increase of PA, on the decrease of SED and the development of positive attitudes towards PA in both children and parents could be an interesting mean to promote PA in interventions aiming to improve families’ health.

Missing data are often unavoidable. The reason values go missing, along with decisions made of how missing data are handled (deleted or imputed), can have a profound effect on the validity and accuracy of study results. In this article, we aimed to: estimate the proportion of studies in football research that included a missing data statement, highlight several practices to avoid in relation to missing data, and provide recommendations for exploring, visualising and reporting missingness. Football related articles, published in 2019 were studied. A survey of 136 articles, sampled at random, was conducted to determine whether a missing data statement was included. As expected, the proportion of studies in football research that included a missing data statement was low, at only 11.0% (95% CI: 6.3% to 17.5%); suggesting that missingness is seldom considered by researchers. We recommend that researchers describe the number and percentage of missing values, including when there are no missing values. Exploratory analysis should be conducted to explore missing values, and visualisations describing missingness overall should be provided in the paper, or at least supplementary materials. Missing values should almost always be imputed, and imputation methods should be explored to ensure they are appropriately representative. Researchers should consider these recommendations, and pay greater attention to missing data and its influence on research results.

Purpose Heat-and-moisture-exchanging devices (HME) are commonly used by endurance athletes during training in sub-zero environments, but their effects on performance are unknown. We investigated the influence of HME usage on running performance at − 15 °C. Methods Twenty-three healthy adults (15 male, 8 female; age 18–53 years; $$\dot{V}{\text O}_{2peak}$$ V ˙ O 2 p e a k men 56 ± 7, women 50 ± 4 mL·kg−1·min−1) performed two treadmill exercise tests with and without a mask-style HME in a randomised, crossover design. Participants performed a 30-min submaximal warm-up (SUB), followed by a 4-min maximal, self-paced running time-trial (TT). Heart rate (HR), respiratory frequency (fR), and thoracic area skin temperature (Tsk) were monitored using a chest-strap device; muscle oxygenation (SmO2) and deoxyhaemoglobin concentration ([HHb]) were derived from near-infra-red-spectroscopy sensors on m. vastus lateralis; blood lactate was measured 2 min before and after the TT. Results HME usage reduced distance covered in the TT by 1.4%, despite similar perceived exertion, HR, fR, and lactate accumulation. The magnitude of the negative effect of the HME on performance was positively associated with body mass (r2 = 0.22). SmO2 and [HHb] were 3.1% lower and 0.35 arb. unit higher, respectively, during the TT with HME, and Tsk was 0.66 °C higher during the HME TT in men. HR (+ 2.7 beats·min−1) and Tsk (+ 0.34 °C) were higher during SUB with HME. In the male participants, SmO2 was 3.8% lower and [HHb] 0.42 arb. unit higher during SUB with HME. Conclusion Our findings suggest that HME usage impairs maximal running performance and increases the physiological demands of submaximal exercise.

Cancer-related fatigue can continue long after curative cancer treatment. The aim of this study was to investigate sleep and rest–activity cycles in fatigued and non-fatigued cancer survivors. We hypothesized that sleep and rest–activity cycles would be more disturbed in people experiencing clinically-relevant fatigue, and that objective measures of sleep would be associated with the severity of fatigue in cancer survivors. Cancer survivors (n = 87) completed a 14-day wrist actigraphy measurement to estimate their sleep and rest–activity cycles. Fatigue was measured using the Functional Assessment of Chronic Illness Therapy Fatigue Scale (FACIT-F). Participants were dichotomised into two groups using a previously validated score (fatigued n = 51 and non-fatigued n = 36). The participant’s perception of sleep was measured using the Insomnia Severity Index (ISI). FACIT-F score was correlated with wake after sleep onset (r = −0.28, p = 0.010), sleep efficiency (r = 0.26, p = 0.016), sleep onset latency (r = −0.31, p = 0.044) and Insomnia Severity Index (ISI) score (r = −0.56, p &lt, 0.001). The relative amplitude of the rest–activity cycles was lower in the fatigued vs. the non-fatigued group (p = 0.017, d = 0.58). After treatment for cancer, the severity of cancer-related fatigue is correlated with specific objective measures of sleep, and there is evidence of rest–activity cycle disruption in people experiencing clinically-relevant fatigue.

Background: Despite the progress made in the study of subjective measures in resistance training, some questions remain unanswered. Here the authors investigated if ratings of perceived exertion (RPE) can predict task failure and bar velocity across exercises and loads as a primary outcome and whether a battery of subjective measures differ as a function of the lifted loads as a secondary outcome. Methods: In this preregistered study, 20 resistance-trained subjects (50% female) first completed a 1-repetition-maximum test of the barbell squat and bench press. In the second and third sessions, they completed 2 sets of squats followed by 2 sets of bench press to task failure, using 70% or 83% of 1-repetition maximum, while bar velocity was recorded. RPE scores were recorded after every repetition. In addition to RPE, rating of fatigue, affective valence, enjoyment, and load preferences were collected after set and session completion. Results: Across conditions, RPE was strongly correlated with reaching task failure (r = .86) and moderately correlated with bar velocity (r = −.58). The model indicates that an increase in 1 RPE unit is associated with an 11% shift toward task failure and a 4% reduction in bar velocity, with steeper slopes observed in the heavier condition. Negligible differences were observed between the load conditions in rating of fatigue, affective valence, enjoyment, and load preference. Conclusion: RPE scores, collected on a repetition-by-repetition basis, accurately reflected reaching task failure across loads and conditions. Hence, RPE can be used to prescribe repetition numbers during ongoing sets. The negligible differences between load conditions in rating of fatigue, affective valence, enjoyment, and load preference indicate that when sets are taken to task failure, loads can be selected based on individual preferences.

We examined two questions relating to athletes use of psychological skills and techniques (PS). First, we consider whether athletes differ in the configuration of PS they use. Second, we examine how PS use is related to both self-reported and informant-rated mental toughness. A sample of 309 elite Thai athletes reported their frequency of PS use in practice and competition settings and completed a self-report measure of mental toughness; coaches provided informant ratings of mental toughness for a subset of athletes. Using latent profile analysis, we replicated previous findings (Ponnusamy, Lines, Zhang, & Gucciardi, 2018) to show that athletes could be best classified in to three subgroups based on their PS use, and these subgroups differed in the relative frequency of their PS use rather than in the specific patterns of PS. Further, we find that mental toughness differed as a function of PS use with higher frequency of PS use associated with higher self-rated mental toughness, and higher coach-ratings of mental toughness. These findings suggest that athletes do not appear to differ in the configurations of PS used and show that PS not only relate to self-perceptions of mental toughness but also to the display of more mentally tough behaviour

Self-paced exercise is any physical activity in which the effort has to be distributed over time in order to achieve the objective of the event. Hence, self-paced aerobic exercise is a goal-directed behaviour towards an objective that involves several cognitive processes. The aim of the present review is to ask the extent to which self-paced exercise might rely on executive functions and the empirical evidence of top-down processing on self-paced exercise. We discuss the evidence from different experimental manipulations showing a potential link between self-paced exercise and executive processing. We finally highlight some gaps in the literature and possible factors that might mediate the role of executive processing and self-paced exercise. Self-paced exercise is likely to be a highly complex process, in which a multitude of factors non-related to executive functions can also contribute to the ultimate decision to upregulate or downregulate exercise intensity.

Examine the association between physical activity and sedentary time with high sensitivity C-Reactive protein levels in adults with arthritis and fibromyalgia. We also investigated the dose of physical activity that was associated with lower clinical levels of high sensitivity C-Reactive protein (

The Coronavirus Disease-19 (COVID-19) pandemic forced the Norwegian male premier league football season to reschedule, reducing the fixture calendar substantially. Previous research has shown that a congested match schedule can affect injury rates in professional football. Therefore, we aimed to investigate whether the Norwegian premier league teams suffered more injuries in the more match congested 2020 season than in the regular 2019-season. We invited all teams having participated in both seasons to export their injury data. Only teams that used the same medical staff to register injuries in both seasons were included, and to maximize data comparability between seasons, we applied a time-loss injury definition only. Seven of 13 teams agreed to participate and exported their injury data. Both seasons had 30 game weeks, but the 2020 season was 57 days shorter than the 2019 season. The match injury incidence did not differ significantly [incidence rate ratio 0.76 (0.48–1.20; p = 0.24) in the 2020 season compared to the 2019 season. Furthermore, we found no differences in the number of injuries, days lost to injury, matches missed to injury, or injury severity. We could not detect any differences between the two seasons, suggesting the congested match calendar combined with the safety measures in the 2020 season can be a safe alternative in future seasons. Injury characteristics in Norwegian male professional football: A comparison between a regular season and a season in the pandemic

A simple approximate theory of snow machining is applied to modelling successive wedge turns of alpine skiing. The model involves predefined control functions describing skier’s control over the turns via angle of attack, edge angle and loading of the skis. To demonstrate the model’s potential, reasonable control functions with a small number of free parameters are designed and used in attempt to reproduce the data obtained in a previous field study by other researches. The results are in semi-quantitative agreement with the data. In particular, the model explains the nature of the abnormally high values for the “coefficient of friction” deduced in that study. Future field studies of wedge turns should aim at measuring the angle of attack, edge angle and loading of the skis. This will allow to determine the control functions from the experimental data and hence to conduct a more stringent verification of the model.

Medical surveillance and risk mitigation protocols to reduce viral transmission have underpinned the return of elite football during the COVID-19 pandemic. This article describes the evidence-informed approach and surveillance findings from the English Football League across a 9-week period at the end of the 2019-20 season. Protocols were devised by the lead EFL Medical Advisor with specialist occupational medicine input. Isolation requirements for cases and contacts were in-line with UK Government regulations, with external contact tracing conducted by local public health authorities. Quantitative PCR testing was conducted twice weekly and within 72 hours of fixtures. 43 individuals, including 18 players returned positive tests. No positive results were returned after week 5 (round 10). Our findings support those from other leagues that with appropriate compliance, elite football can continue safely during this pandemic. We recommend that protocols and compliance should be revised as necessary according to community prevalence and changes in viral transmission dynamics.

Background The subjective experience of fatigue impairs an individual’s ability to sustain physical endurance performance. However, precise understanding of the specific role perceived fatigue plays in the central regulation of performance remains unclear. Here, we examined whether the subjective intensity of a perceived state of fatigue, pre-induced through prior upper body activity, differentially impacted performance and altered perceived effort and affect experienced during a sustained, isometric contraction in lower body. We also explored whether (cardiac) interoception predicted the intensity of experienced perceptual and affective responses and moderated the relationships between constructs during physical activity. Methods Using a repeated-measures study design, thirty male participants completed three experimental conditions, with the intensity of a pre-induced state of fatigue manipulated to evoke moderate (MOD), severe (SEV) and minimal (control; CON) intensity of perceptions prior to performance of the sustained contraction. Results Performance of the sustained contraction was significantly impaired under a perceived state of fatigue, with reductions of 10% and 14% observed in the MOD and SEV conditions, respectively. Performance impairment was accompanied by greater perceived effort and more negative affective valence reported during the contraction. However, effects were limited to comparisons to CON, with no difference evident between the two experimental trials (i.e. MOD vs. SEV). Individuals’ awareness of their accuracy in judging resting heartbeats was shown to predict the subjective intensity of fatigue experienced during the endurance task. However, interoception did not moderate the relationships evident between fatigue and both perceived effort and affective valence. Conclusions A perceived state of fatigue limits endurance performance, influencing both how effortful activity is perceived to be and the affective experience of activity. Though awareness of interoceptive representations of bodily states may be important to the subjective experience of fatigue, interoception does not modulate the relationships between perceived fatigue and other perceptual (i.e. effort) and affective constructs.

Performance indicators that contributed to success at the group stage and play-off stages of the 2019 Rugby World Cup were analysed using publicly available data obtained from the official tournament website using both a non-parametric statistical technique, Wilcoxon's signed rank test, and a decision rules technique from machine learning called RIPPER. Our statistical results found that ball carry effectiveness (percentage of ball carries that penetrated the opposition gain-line) and total metres gained (kick metres plus carry metres) were found to contribute to success at both stages of the tournament and that indicators that contributed to success during the group stages (dominating possession, making more ball carries, making more passes, winning more rucks, and making less tackles) did not contribute to success at the play-off stage. Our results using RIPPER found that low ball carries and a low lineout success percentage jointly contributed to losing at the group stage, while winning a low number of rucks and carrying over the gain-line a sufficient number of times contributed to winning at the play-off stage of the tournament. The results emphasise the need for teams to adapt their playing strategies from the group stage to the play-off stage at tournament in order to be successful.

The concept of competitive balance is considered to be an essential aspect in the field of sport economics. This work describes a novel approach for measuring and evaluating competitive balance through concentration of championships. The concentration of championships was assessed using a sliding window approach with the length of five consecutive competitions (years) and a single competition (year) increment over the whole evaluated period. Because the sliding window was relatively short, the newly developed index, termed ‘We Are the Champions’ (WAC5), is sensitive to rapid changes in competitive balance. The WAC5 index, average WAC5, expected WAC5, and ΔWAC5 were applied to data from 68 competitions of several individual and team sports collected for the 1960 – 2020 period. The significance of indices was tested by resampling (bootstrapping and permutation). The results of the study show a growth in competitive balance of several ice hockey competitions (national and international), but decreasing competitive balance in Formula 1 racing and in several European soccer competitions. In soccer competitions, there was a substantially lower competitive balance in a league than in a domestic cup competition within each country/federation. The difference between the overall competitive balance in the most popular, North American, professional leagues and the top European soccer leagues is growing. A significant grouping of champions was determined for all sports involving individual athletes, but also for several team competitions.

Recent discussions in the sport and exercise science community have focused on the appropriate use and reporting of effect sizes. Sport and exercise scientists often analyze repeated-measures data, from which mean differences are reported. To aid the interpretation of these data, standardized mean differences (SMD) are commonly reported as description of effect size. In this manuscript, we hope to alleviate some confusion. First, we provide a philosophical framework for conceptualizing SMDs; that is, by dichotomizing them into two groups: magnitude-based and signal-to-noise based SMDs. Second, we describe the statistical properties of SMDs and their implications. Finally, we provide high-level recommendations for how sport and exercise scientists can thoughtfully report raw effect sizes, SMDs, or other effect sizes for their own studies. This conceptual framework provides sport and exercise scientists with the background necessary to make and justify their choice of an SMD. The code to reproduce all analyses and figures within the manuscript can be found at the following link: https://www.doi.org/10.17605/OSF.IO/FC5XW.

International audience; This study compared changes in the energy-time profiles in pole vaulting using several body models. Two-dimensional kinematics were collected from 20 successful vaults (5.20-6.01 m) performed by 10 athletes during a national meet. The linear and angular kinetic, potential, and total mechanical energy-time profiles were obtained from three pole vaulter models composed of 12, 5, and 3 segments (M12, M5, and M3, respectively), as well as calculated and approximated centre of mass models. One-dimensional statistical parametric mapping was used to compare these energy-time profiles from the models, while agreements of discrete energy parameters were assessed. For all the studied energy-time profiles, there was a main effect (0.05 < p < 0.001) of the models, but pairwise comparisons showed that M5 presented the lowest differences with M12 in comparison with the other models (M3 and approximated centre of mass models). In addition, M5 showed better agreement (lower bias and small effect size) with M12 for the studied energy parameters compared to the other models. Therefore, M5 may be a reliable option to simplify the body model and speed up the computation of the energy-time profiles of the pole vaulter.

BACKGROUND: The prevalence of doping in competitive sport, and the methods for assessing prevalence, remain poorly understood. This reduces the ability of researchers, governments, and sporting organizations to determine the extent of doping behavior and the impacts of anti-doping strategies. OBJECTIVES: The primary aim of this subject-wide systematic review was to collate and synthesize evidence on doping prevalence from published scientific papers. Secondary aims involved reviewing the reporting accuracy and data quality as evidence for doping behavior to (1) develop quality and bias assessment criteria to facilitate future systematic reviews; and (2) establish recommendations for reporting future research on doping behavior in competitive sports to facilitate better meta-analyses of doping behavior. METHODS: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were used to identify relevant studies. Articles were included if they contained information on doping prevalence of any kind in competitive sport, regardless of the methodology and without time limit. Through an iterative process, we simultaneously developed a set of assessment criteria; and used these to assess the studies for data quality on doping prevalence, potential bias and reporting. RESULTS: One-hundred and five studies, published between 1975 and 2019,were included. Doping prevalence rates in competitive sport ranged from 0 to 73% for doping behavior with most falling under 5%. To determine prevalence, 89 studies used self-reported survey data (SRP) and 17 used sample analysis data (SAP) to produce evidence for doping prevalence (one study used both SRP and SAP). In total, studies reporting athletes totaled 102,515 participants, (72.8% men and 27.2% women). Studies surveyed athletes in 35 countries with 26 involving athletes in the United States, while 12 studies examined an international population. Studies also surveyed athletes from most international sport federations and major professional sports and examined international, national, and sub-elite level athletes, including youth, masters, amateur, club, and university level athletes. However, inconsistencies in data reporting prevented meta-analysis for sport, gender, region, or competition level. Qualitative syntheses were possible and provided for study type, gender, and geographical region. The quality assessment of prevalence evidence in the studies identified 20 as "High", 60 as "Moderate", and 25 as "Low." Of the 89 studies using SRP, 17 rated as "High", 52 rated as "Moderate", and 20 rated as "Low." Of the 17 studies using SAP, 3 rated as "High", 9 rated as "Moderate", and 5 rated as "Low." Examining ratings by year suggests that both the quality and quantity of the evidence for doping prevalence in published studies are increasing. CONCLUSIONS: Current knowledge about doping prevalence in competitive sport relies upon weak and disparate evidence. To address this, we offer a comprehensive set of assessment criteria for studies examining doping behavior data as evidence for doping prevalence. To facilitate future evidence syntheses and meta-analyses, we also put forward "best practice" recommendations and reporting guidelines that will improve evidence quality. ispartof: SPORTS MEDICINE vol:51 issue:9 pages:1909-1934 ispartof: location:New Zealand status: published

Tendinopathy is a chronic degenerative musculoskeletal disorder that is common in both athletes and the general population. Exercise and extracorporeal shockwave therapy (ESWT) are among the most common treatments used to mediate tendon healing and regeneration. The review presents current understanding of mechanisms of action of ESWT and exercise in isolation and briefly synthesises evidence of their effectiveness for various tendinopathies. The central purpose of the review is to synthesise research findings investigating the combination of ESWT and exercise for five common tendinopathies (plantar heel pain, rotator cuff, lateral elbow, Achilles, and patellar tendinopathy) and provide recommendations on clinical applicability. Collectively, the available evidence indicates that ESWT combined with exercise in the form of eccentric training, tissue specific stretching or heavy slow resistance training are effective for specific tendinopathies and can therefore be recommended in treatment. Whilst there are at present a limited number of studies investigating combined EWST and exercise approaches, there is evidence to suggest that the combination improves outcomes in treatment of plantar heel pain, Achilles, lateral elbow, and rotator cuff tendinopathy. However, despite overall positive outcomes in patellar tendinopathy, the combined treatment has not been shown at present to offer additional benefit over eccentric exercise alone.

The COVID-19 pandemic has caused mandatory lockdowns leading to disruptions in sports training programs. This study aimed to determine the effects of a 16-week COVID-19 lockdown on body composition as well as kinetic and kinematic parameters of the countermovement jump (CMJ) for professional martial artists. Thirteen (n=13) professional martial artists participated in this retrospective cohort study. Subjects were tested on the CMJ at four timepoints: 1) pre-lockdown (pre), 2) immediately post-lockdown (post), 3) two weeks post-lockdown (post+2), and 4) four weeks post-lockdown (post+4). Body composition was measured via bioelectrical impedance and jump data were collected using a force platform sampling at 1,000 Hz. Individual repeated-measures ANOVAs were conducted with pairwise post-hoc analyzes. Differences were observed in vertical jump height (VJH) of 10.33%, peak velocity (PV) of 3.10%, reactive strength index modified (RSImod) of 13.8%, and peak propulsive power (PPP) of 6.00% (p

Movement behaviours have been found to be important correlates of health for children and may be particularly important for children with Developmental Coordination Disorder (DCD) who often experience greater mental health problems. To date, however, little research has investigated the daily movement composition of preschool children with Developmental Coordination Disorder (DCD) and/or its association with mental health. The purpose of the current study was to: 1) examine whether differences in movement compositions (i.e., sedentary time, light physical activity, moderate-to-vigorous activity) exist between typically developing (TD) preschool-age children and those at risk for DCD (rDCD); and 2) investigate associations between movement compositions and mental health indicators. This cross-sectional study used the baseline cohort data from the Coordination and Activity Tracking in CHildren (CATCH) study. A total of 589 preschool-age children (Mage = 4.94 ± 0.59 years; 57.4% boys) were included in this analysis, of which 288 were classified as rDCD. Wake time movement behaviours were measured using accelerometers and parents completed the Child Behavior Checklist to assess their child’s mental health (i.e., internalizing and externalizing problems). Compositional data analysis techniques were used. After adjusting for potential confounders, the results demonstrated similar movement compositions between TD and rDCD children. Among the full sample, findings revealed a significant association between sedentary time and externalizing problems, however, each of the other associations did not reach statistical significance. These results are consistent with emerging evidence demonstrating similar patterns of physical activity and sedentary time among TD children and those classified as rDCD during the preschool years. Although movement behaviours explained little variance in mental health during this period, future research should investigate when movement compositions diverge, and how these changes may impact the mental health of TD children and those classified as rDCD later in childhood.

Periodizing rehearsal and performance schedules in professional ballet is difficult given a lack of published longitudinal data. We aimed to describe the structure of a professional ballet season, and identify factors associated with inter-dancer and inter-production variation in dance hours. Scheduling data were collected from 123 dancers over five seasons at The Royal Ballet. Linear mixed effects models were used to evaluate differences in weekly dance hours and performance counts across sexes, company ranks, and months. Random forest regressions were used to investigate factors associated with the variation in rehearsal hours across different productions. Performance congestion was observed in December, whereas total dance hours peaked between January and April. Differences in weekly dance hours were observed between company ranks (p < .001, range in means: 19.1–27.5 h·week-1). Seasonal performance counts varied across company ranks (p < .001), ranging from 28, 95% CI [22, 35] in principals, to 113, 95% CI [108, 118] in artists. Rehearsal durations were greatest in preparation for newly choreographed and longer ballets. Dancers creating roles in new ballets completed considerably more rehearsal hours than for existing ballet. These results provide a basis for the implementation of rehearsal and repertoireperiodization in professional ballet.

During COVID-19 home confinement, athletes are likely exposed to some level of detraining (i.e. the partial or complete loss of training-induced morphological and physiological adaptations), as a consequence of insufficient and/or inappropriate training stimuli. Such changes may result in impaired performance and increased injury risk if, upon restart, an appropriate sport-specific reconditioning cannot be granted. With this editorial, we aim to recommend extreme caution in sports programming after the COVID-19 emergency

This study examined the between-person associations of seven health behaviors in adults with obesity participating in a weight loss intervention, as well as the covariations between these behaviors within-individuals across the intervention. The present study included data from a 12-month weight loss trial (N = 278). Seven health behaviors (physical activity, sedentary behavior, sleep duration, and consumption of fruits, vegetables, total fat and added sugar) were measured at baseline, 6- and 12-months. Between- and within-participants network analyses were conducted to examine how these behaviors were associated through the 12-month intervention and covaried across months. At the between-participants level, associations were found within the different diet behaviors and between total fat and sedentary behaviors. At the within-participants level, covariations were found between sedentary and diet behaviors, and within diet behaviors. Findings suggest that successful multiple health behaviors change interventions among adults with obesity will need to (1) simultaneously target sedentary and diet behaviors; and (2) prevent potentialcompensatory behaviors in the diet domain.

Purpose: The assessment of voluntary activation of the knee extensors using transcranial magnetic stimulation (VATMS) is routinely performed to assess the supraspinal function. Yet methodological scrutiny of the technique is scarce. The aim of the present study was to examine face validity and reliability of VATMS and its two main determinants (superimposed twitch during a maximal voluntary contraction [SIT100%] and estimated resting twitch [ERT]). Methods: SIT100%, ERT, and VATMS were measured on 10 healthy males (age: 24 ± 5 years) before and following intermittent isometric fatiguing exercise on two separate occasions. Results: The findings indicated issues regarding the accuracy of ERT and suggested a three-point relationship should not be used to determine ERT. Reliabilities for VATMS, SIT100% and ERT were acceptable pre- but much weaker post-exercise (especially for SIT100%). Despite statistically significant changes in main neuromuscular variables following the intermittent isometric fatiguing exercise (P

Background\ud In sport the narrative is changing from anti-doping to pro-clean sport. Yet, our understanding of what ‘clean sport’ means to athletes is notably absent from the literature.\ud \ud Objectives\ud Working together with elite athletes and National Anti-Doping Organisations (NADOs), this study explored the meaning and importance of ‘clean sport’ and ‘clean athlete identity’.\ud \ud Design\ud Community-based participatory research design was employed to explore (a) how elite athletes define clean sport and being a clean athlete; (b) the hopes and challenges associated with clean sport and being a clean athlete; and (c) what can be done in anti-doping to elicit clean sport.\ud \ud Methods\ud Five elite athletes in five European countries (Germany, Ireland, Netherlands, Slovenia and United Kingdom) were recruited as co-researchers by their respective NADOs, trained for their role as co-researchers and individually interviewed. Seventy-seven elite athletes were then purposefully recruited for 12 athlete-led national focus groups. Finally, the five athlete co-researchers and five athlete participants took part in one 2.5-hour long international focus group.\ud \ud Results\ud Reflexive thematic analysis resulted in generating four overarching themes: ‘clean is being true to the self’, ‘clean performance enhancement has multiple meanings’, ‘clean is not a solo act’ and ‘the problems and solutions are systemic’. Collectively, the themes showed that the clean athlete identity is generally rooted in upbringing, early experiences and love of sport; and characterised by continued, intrinsically motivated commitment to fundamental values and morals acquired in childhood. In contrast, the concept of clean performance-enhancement is highly idiosyncratic and flexible. Elite athletes value anti-doping efforts but their experiences of disparity and unfairness in doping control undermine their trust in anti-doping.\ud \ud Conclusion\ud Clean athlete identity is a social endeavour and artefact, which needs to be reflected in and developed through evidence-informed anti-doping interventions. Raising athletes' voices via co-collaboration and participatory research can be an enriching experience for athletes and researchers alike, and a worthwhile endeavour for sport organisations with responsibility for anti-doping. To make anti-doping education personally relevant, the richness of individual interpretation of ‘clean’ for the self (i.e., clean athlete identity) and performance-enhancement must be acknowledged, respected and cultivated.

Background: The role of cheering in home advantage in sports performance is the subject of much debate. No definitive scientific evidence has so far been found capable of highlighting or denying its relevance. As pandemic restrictive measures (COVID-19) have prevented crowds from entering stadiums, analysis of the past two football seasons may reveal important new details. Objective: This paper aims to compare the statistics of the last two football seasons in Italy with the previous six, trying to highlight any pronounced and statistically significant changes due to the absence of cheering in the stadiums. Methods: We compared the average percentages of points obtained in home matches from 2013 to 2019 with those in the timelapse 2019-2021. The same operation was performed with referee statistics, such as fouls, penalties, and cards awarded against home teams. To do this, we used measures such as Welch's t-test and percentage increases. The distributive normality of the datasets was evaluated with the Shapiro-Wilk test and a graphical control. The lack of trend in the series was assessed with the Mann-Kendall test and Sen's Slope. Finally, Pearson and Spearman's correlations were searched between the percentages of points collected in home matches and total points, year by year, from 2013 to 2021.Results: The average percentage of points collected by teams in home matches dropped by almost 8% (Welch’s t-test = -4.3). Moreover, the negative correlations between home collected points and total points in 2013-2019 timelapse have drastically diminished during the last two seasons (average Welch’s t-test = 6.0, 95% CI: 5.4 – 6.4), approaching zero. Finally, penalties against home teams have increased by 30% (Welch’s t-test = 2.6), reaching figures closer to 50%.Conclusions: This research provides statistical evidence in favor of the relevance of home advantage in the top football league in Italy, such as Serie A. During the anti-COVID-19 restrictive measures - which prevented public access to the stadiums - a net reduction in the points collected by the teams in home matches was detected. In addition, the number of penalties awarded against home teams has increased significantly, approaching the ideal 50%. Since there are valid psychological reasons in the literature to support the crowd’s impact on sports and refereeing performance, it is plausible that our findings are causally related to the absence of cheering. Finally, as the averages of points collected at home remained far from 50%, our results suggest that a not negligible part of the home advantage in Serie A is linked to factors independent of the audience. Future research can deepen the above phenomena from a theoretical-psychological point of view.

Riding uphill presents a challenge to competitive and recreational cyclists. Based on only limited evidence, some scientists have reported that tilting the saddle nose down improves uphill-cycling efficiency by as much as 6%. Purpose: Here, we investigated if simply tilting the saddle nose down increases efficiency during uphill cycling, which would presumably improve performance. Methods: Nineteen healthy, recreational cyclists performed multiple 5-min trials of seated cycling at ~3 W kg–1 on a large, custom-built treadmill inclined to 8° under two saddle-tilt angle conditions: parallel to the riding surface and 8° nose down. We measured subjects’ rates of oxygen consumption and carbon dioxide production using an expired-gas analysis system and then calculated their average metabolic power during the last two min of each 5-min trial. Results: We found that, compared to the parallel-saddle condition, tilting the saddle nose down by 8° improved gross efficiency from 0.205 to 0.208 –– an average increase of 1.4 ± 0.2%, t = 5.9, p < .001, CI95% [0.9, 1.9], ES = 1.3. Conclusion: Our findings are relevant to competitive and recreational cyclists and present an opportunity for innovating new devices and saddle designs that enhance uphill cycling efficiency. The effect of saddle tilt on other slopes and the mechanism behind the efficiency improvement remain to be investigated.

Shoulder injuries are a common problem in handball. One likely cause of such injuries is excessive throwing. However, it is difficult to measure the number of player throws in large cohort studies using existing methods accurately. Therefore, the purpose of this study is to develop and validate a method for identifying overhead throws using a low-cost inertial measurement unit (IMU) worn on the wrist. In a two-stage approach, we developed a threshold-based automatic identification method for overhead throws in a laboratory study using the IMU. Subsequently, we validated the suggested thresholds in a field setting by comparing throws identified by the threshold-method to throws identified by video recordings of handball practices. The best set of threshold values resulted in a per-player median sensitivity of 100% (range: 84-100%) and a median positive predictive value (PPV) of 96% (range: 86-100%) in the development study. In the validation study, the per-player median sensitivity dropped to 78% sensitivity (range: 52-91%), while the per-player median PPV dropped to 79% (range: 47-90%). The proposed method is a promising method for automatically identifying handball throws in a cheap and feasible way.

Eating disorders (ED) are serious mental disorders, which can have serious health consequences and high mortality rates. Due to facing unique risk factors female athletes have increased susceptibility for ED. Female athletes are also at risk for subclinical conditions such as the Female Athlete Triad. There is a dearth of studies on preventing and identifying ED in female athletes and the role and responsibility of the sports coach is unclear. This study aimed to address the questions of whether female athletes are at increased risk for ED, what interventions currently show promise and what is the role of the sports coach in the intervention process. The study was based on a systematic review of relevant literature retrieved through PubMed and Sports Discus databases. Despite heterogeneity in prevalence studies, findings suggest that female athletes are at higher risk than male athletes and non-athletes and those in elite level sports or sports categorised as lean, aesthetic, endurance and weight-class are at increased risk for clinical and subclinical ED. Risk-factors unique to the sports environment such as weight pressures, competitive thinness and revealing uniforms, may lead to increased risk in female athletes. Despite a dearth of studies on interventions for ED in sport, findings suggest that primary prevention programs based on educating athletes such as ATHENA show most promise in prevention. Secondary prevention should focus on early identification using athlete-specific screening tools. Symptom checklists and pre-participation examinations can also assist coaches in early identification. Psychotherapy interventions such as CBT have had the best results for treatment. Sports coaches’ play a critical role in, early identification, referral, management and prevention of ED in female athletes. However, current findings suggest that many coaches lack knowledge about ED and require education to be able to intervene successfully in female athletes with ED. Inappropriate coaching behaviours have also been found to act as an additional risk-factor for ED. Recommendations for sports coaches in N.I. are provided to assist them in successful intervention, management and return to play of female athletes with ED.

This review highlights the importance of leadership within modern healthcare settings and provided an overview of common healthcare leadership approaches, including transactional and transformational leadership. Research has identified leader characters and specific competencies which are required by leaders in healthcare in order to achieve optimal outcomes. Although both transactional and transformational leadership approaches have their strengths and weaknesses, the evidence presented suggests a transformational leadership approach better suits the specific competencies required within a healthcare leadership context. Interventional, survey and qualitative studies have found a plethora of benefits associated with a transformational leadership approach in healthcare, including better patient outcomes and higher staff satisfaction and motivation compared to other approaches to leadership. Studies conducted with nursing and physiotherapy staff have consistently shown better outcomes with a transformational leadership approach, which is significant as they represent the second and third largest healthcare professions by numbers employed, respectively. Transformational leadership therefore appears to be the most evidence-based approach available within healthcare, at a time when evidence-based practice is considered mandatory within the NHS. Effective leadership within the NHS has never been more critical than at present, due to reduced government spending in healthcare and the increased pressures on the system during the Covid-19 pandemic. Although a transactional leadership approach in isolation has several weaknesses in modern healthcare and may be considered outdated, some of its components still possess merit and may have an additive effect if implemented alongside an overall transformational leadership approach in order to achieve optimal outcomes for patients and staff in healthcare settings.

During the COVID-19 pandemic, the necessity of using face masks during sports is likely balanced by coaches and athletes between the risk of infection and their impact on exercise performance. To inform this decision, we aimed to test the effects of wearing a cloth face mask on exercise performance and subjective responses during training of track and field athletes. Participants (n=10) performed two training sessions with and without a 3-layered cloth mask in a randomized, counterbalanced, crossover design. The training session was designed to simulate the specific demands of the sport that the athletes practiced. The sprint protocol consisted of performing five maximal 30 m sprints, with a passive 4-min interval between runs. Performance variables (sprint time, acceleration) were calculated using the sprint time data. Jump performance was assessed pre- and post-sprints using a countermovement vertical jump. Throughout the training session, ratings of perceived exertion (RPE) and affect were collected. There was no evidence of condition x time interactions for sprint time (P=0.21) or acceleration (P=0.47). There was weak evidence of an effect of condition (P=0.05) on RPE, though no evidence of a condition x time interaction (P=0.35). There was moderate evidence of a condition x time interaction (P=0.02) for affect, with lower ratings following sprints 3, 4 and 5 when using the mask. These findings suggest that wearing a mask may negatively impact subjective feelings of training without necessarily harming sprint performance. During an unmitigated epidemic such as in Brazil, the protection against SARS-CoV-2 infection associated with wearing a face mask appears to outweigh the increased discomfort and perception of effort related to this safety tool.

The recent and rapid developments in track spike innovation have been followed by a wave of record-breaking times and top performances. This has led many to question what role "super spikes" play in improving running performance. To date, the specific contributions of new innovations in footwear, including lightweight, resilient, and compliant midsole foam, altered geometry, and increased longitudinal bending stiffness, to track running performance are unknown. Based on current literature, we speculate about what advantages these features provide. Importantly, the effects of super spikes will vary based on several factors including the event (e.g., 100 m vs. 10,000 m) and the characteristics of the athlete wearing them. Further confounding our understanding of super spikes is the difficulty of testing them. Unlike marathon shoes, testing track spikes comes with a unique challenge of quantifying the metabolic energy demands of middle-distance running events, which are partly anaerobic. Quantifying the exact benefits from super spikes is difficult and we may need to rely on comparison of track performances pre- and post- the introduction of super spikes.

The health benefits of physically activity (PA) are well documented; therefore, promoting PA and associated guidelines to the population is considered an important task for any government. To support the strategy development for communication of the recently updated PA guidelines, the UK Chief Medical Officers’ (CMO) Expert Panel for Communication was created. To help inform this process a rapid review was performed to identify how other nations may be tackling the communication of their PA guidelines and PA more generally. The rapid review used elements of the Health-enhancing physical activity (HEPA) policy audit tool (PAT) created by the World Health Organization (WHO) and investigated all 195 countries. Seventy-seven countries had their own guidelines, 53 used the WHO guidelines (of which 47 used the Regional Office for Africa), and for 65 countries no guidelines could be found. For the communication of PA or PA guidelines, 27 countries used infographics, 56 had government policies/documents, and 11 used a mass media campaign. However only 6 of these communication strategies had been evaluated. Although many countries used infographics, there were no associated evaluations. As such any future communication strategies should incorporate an evaluation of effectiveness. Mass media campaigns had the strongest evidence base, proving to be an effective communication strategy, particularly when incorporating aspects of social marketing. This review provides an insight into what strategies countries worldwide have taken to communicate PA guidelines and PA promotion. These should be carefully considered when deciding how best to communicate and promote PA guidelines.

PurposeThe perception of effort (PE) is widely used to prescribe and monitor exercise during locomotor and resistance tasks. The present study examines the validity of PE to prescribe and monitor exercise during upper-limb motor tasks under various loads and speed requirements.MethodsForty participants volunteered in two experiments. In experiment 1, we used four PE intensities to prescribe exercise on a modified version of the box and block test (BBT) and a pointing task. We investigated the possibility of monitoring the exercise intensity by tracking changes in PE rating in response to three different tempos or additional weights. Experiment 2 replicated the possibility of prescribing the exercise with the PE intensity during the BBT and explored the impact of additional weights on performance and PE during the standardized version of the BBT. Muscle activation, heart rate, and respiratory frequencies were recorded.ResultsIn experiment 1, increasing the PE intensity to prescribe exercise induced an increased performance between each intensity. Increasing task difficulty with faster movement tempo and adding weight on the forearm increased the rating of PE. Experiment 2 replicated the possibility to use PE intensity for exercise prescription during the BBT. When completing the BBT with an additional weight on the forearm, participants maintained performance at the cost of a higher PE. In both experiments, changes in PE were associated with changes in muscle activation.ConclusionOur results suggest that PE is a valid tool to prescribe and monitor exercise during upper-limb motor tasks.

Objectives: To conduct a systematic review and multilevel meta-analysis of the current literature as to the effects of interval training (IT) vs moderate intensity continuous training (MICT) on measures of body composition, both on a whole-body and regional level. Design: Systematic review and meta-analysis. Data sources: English-language searches of PubMed/MEDLINE, Scopus, and CINAHL conducted in accordance with PRISMA guidelines. Eligibility criteria for selecting studies: a) randomized controlled trials that directly compared IT vs MICT body composition using a validated measure in healthy children and adults; b) training was carried out a minimum of once per week for at least four weeks; c) published in a peer-reviewed English language journal or on a pre-print server. Results: The main model for fat mass effects revealed a trivial standardized point estimate with high precision for the interval estimate, with negligible heterogeneity. The main model for lean mass effects revealed a trivial standardized point estimate with high precision for the interval estimate, with negligible heterogeneity. The GRADE summary of findings suggested high certainty for both main model effects. In comparison to non-intervention control groups, the IT conditions resulted in small reductions in fat mass and trivial increases in lean mass. The MICT conditions also produced small reductions in fat mass, and trivial increases in lean mass. Analysis of regional fat loss revealed trivial between group comparative treatment effects for upper body, lower body and trunk regions with minimal differences between regions. Conclusion: Our findings provide compelling evidence that the intensity of effort during endurance exercise has minimal influence on longitudinal changes in fat mass and lean mass.

While research has identified several practice variables that purportedly enhance motor learning, recent replication failures highlight the importance of conducting high-powered, pre-registered replications. The “expecting to teach” phenomenon was first reported in the motor learning literature by Daou and colleagues and suggested learners benefit from practicing with the understanding they will later need to teach the skill. The extant data have been mixed but generally positive. While expecting to teach has been shown to enhance motor learning of a golf putt, the mechanisms linked with this benefit are yet to be determined. As such, this study sought to replicate the expecting to teach effect and to extend those findings by exploring participants’ thought processes. Participants (N = 76) were randomly assigned to one of two groups in which they were told that they were learning a golf putt in order to 1) be tested on the skill or 2) to teach the skill to another individual. On Day 1, participants completed pre-test putts, a pre-acquisition intrinsic motivation inventory (IMI), a 2-minute study of an instructional booklet, 50 practice putts and a post-acquisition IMI. During practice, participants were also afforded opportunities to continue studying the booklet and to complete additional putts. Participants returned 24-hours later to complete a retention, a transfer (50 cm longer golf-putt), and a free recall test, as well as a post-study survey to reveal thoughts they engaged in after practice but before (or during) the retention test. Similar to Daou et al., no significant differences were found with study time, number of acquisition putts, or motivation. However, golf-putting performance during retention resulted in no differences for radial error, g = −.13 (95%CI [−.55, .29]), between the two groups and no differences were shown for the recall test. The present study fails to replicate the benefits reported in the original experiments.

Background: The level of effort seems to play a key role in determining neuromuscular adaptations; however, less is known regarding the optimal dose-response for intra-set levels of effort on chronic resistance training (RT) adaptations. Objective: We aimed to synthesize the current literature on chronic RT adaptations in response to different intra-set velocity loss (VL) thresholds in the back squat exercise. We investigated changes in muscle strength, muscular endurance, sports-related physical performance, and muscle hypertrophy outcomes during resistance exercise to establish optimal dose-response relationships in physically active individuals.Methods: We conducted a literature search using PubMed (Medline), Web of Science™, Scopus, and Cochrane up to April 2021, with no restriction on year of publication. The inclusion criteria were based on the PICO strategy. A random-effect meta-analysis was performed to determine the standardized mean differences (SMD ± 95% confidence intervals) for different intra-set VL thresholds (low VL [< 15%], moderate VL [≥ 15% and < 30%], and high VL [≥ 30%]) in RT on maximum muscular strength, bar velocity against submaximal loads, endurance against a given load, countermovement jump height, running sprint time, and muscle hypertrophy. Results: A total of 4,031 articles were found and 11 studies met our eligibility criteria. Pooled results revealed improvements between pre- and post-training intervention in 1RM strength (SMD = 0.78; p < 0.001); bar velocity outputs (light-loads [SMD = 0.79; p < 0.001] and heavy-loads [SMD = 2.08; p < 0.001]); endurance against a given load (SMD = 1.21; p < 0.001); countermovement jump height (SMD = 0.50; p < 0.001); running sprint time (SMD = - 0.28; p = 0.001); and muscle hypertrophy (SMD = 0.31; p = 0.05), with no significant difference between VL thresholds (p > 0.05). However, low VL elicited greater within-group SMD for 1RM strength than moderate and high VL thresholds (SMD = 0.93; 0.72; and 0.75; for low, moderate, and high VL thresholds, respectively). Low and moderate VL thresholds resulted in greater within-group SMD than high VL thresholds for velocity against light loads (SMD for low VL = 0.89; moderate VL = 0.90; high VL = 0.59); countermovement jump height (SMD for low VL = 0.51; moderate VL = 0.58; high VL = 0.36); and running sprint time (SMD for low VL = -0.49; moderate VL = -0.32; high VL = -0.09). Moderate and high VL thresholds induced higher within-group SMD for muscle hypertrophy than low VL (SMD for low VL = 0.14; moderate VL = 0.40; high VL = 0.44). Conclusions: Low to moderate VL thresholds may provide more effective and efficient training stimuli for improving performance in strength-power tasks, due to the similar or even greater chronic adaptations achieved compared with high VL, despite the lower number of repetitions performed during the RT program. Conversely, moderate to high VL may provide more favorable training stimuli for inducing muscle hypertrophy. Strength coaches may apply these dose-response trends to design optimal RT stimuli based on their specific training goals. Protocol registration: The study protocol was registered at the International Prospective Register of Systematic Reviews (PROSPERO) database (CRD42020189321).

Purpose: Elite swimmers (SW) have reduced diastolic function compared to elite runners, possibly as an adaptation to the aquatic training environment. Water polo players (WP) and artistic swimmers (AS) are exposed to the same hydrostatic pressures as SW, but are subject to different training intensities, postures, and hemodynamic stressors. Our purpose was to compare resting and exercising cardiac function in elite SW, WP, and AS, to characterize the influence of training for aquatic-sport on left ventricular (LV) adaptation.Methods: Ninety athletes (SW:20M/17F; WP:21M/9F; AS:23F) at the 2019 FINA World Championships volunteered for resting and stress (3min 30% maximal isometric handgrip) echocardiographic assessment of LV global function and mechanics. Results: Male SW displayed improved resting systolic and diastolic function compared to WP; however, both groups maintained stroke volume under high-pressure handgrip stress (SW:∆-4±12%; WP:∆-1±13%, P=0.11). There were no differences between female SW and WP resting LV function, but SW demonstrated improved function over AS. During isometric handgrip, all female sport athletes maintained stroke volume (SW:∆3±16%; WP:∆-10±11%; AS:∆-2±14%, P=0.46), but WP had improved apical rotation (∆1.7±4.5°), which was reduced in AS (∆-3.1±4.5°) and maintained in SW (∆-0.5±3.8°, P=0.04). Unlike SW and WP, AS displayed a unique maintenance of early filling velocity during handgrip exercise (SW:∆-3.5±14.7cm/s; WP:∆-15.1±10.8cm/s; AS:∆1.5±15.3cm/s, P=0.02).Conclusion: Among male athletes, SW display primarily volume-based functional adaptations distinct from the mixed volume-pressure adaptations of WP; however, both groups can maintain stroke volume with increased afterload. Female SW and WP do not demonstrate sport-specific differences like males, perhaps owing to sex-differences in adaptation, but have greater volume-based adaptations than AS. Lastly, AS display unique functional adaptations, that may be driven by elevated pressures under low-volume conditions.

Despite the multiple health benefits that come from engaging in physical activity, data suggests that children are moving less. Novel approaches to engaging children in physical activity are needed to address this public health concern. Recently a new definition of physical activity was proposed which emphasises, amongst other things, the fact that physical activity is deeply affective, emotional and situated in spaces which shape the experience. With the need to increase engagement in physical activity, and this new proposed definition, this paper presents a more novel approach to addressing this problem through staging a physically active experience. The idea draws upon the well-established area of experience economy, which aims to engage those partaking in an educational, (e)aesthetic, escapist, and entertaining way. By staging physical activity as an experience, it is proposed that children can actively partake in physical activity in a way which is focused on the experience offered. This paper explains the notion of experience economy and provides examples of how it could be applied to children’s physical activity. Future research should examine the staging of physically active experiences for children and evaluate the practical implementation and effectiveness of this new approach to increasing children’s engagement in physical activity.

Research investigating coaching effectiveness is of great importance to ensure the sporting experience and development of athletes is optimised. Coaches are significant figures for the athletes they coach, especially for youth athletes within sporting programmes. Therefore, understanding what makes an ‘effective coach’ in terms of leadership and coaching behaviours will only aid positive youth development and help ensure youth athletes are afforded optimal opportunities to enhance their skills and attributes. This systematic review aims to present a comprehensive review of the coaching effectiveness literature. A systematic search was conducted of four electronic databases: PsycArticles, PsycINFO, SPORTDiscus, and Web of Science. Scholarly peer-reviewed studies published in English were included in this review. The initial search yielded 137 papers, with 45 papers retained and referenced within the review following screening. Studies either developed a measurement tool to assess coaching behaviour, evaluated a measurement tool, or employed such tools in studies assessing sources, dimensions or outcomes of coaching behaviour. Overall, the review offers support for the importance of athletes’ perceptions of coaching behaviours in shaping an athletes’ psychological development and well-being. Understanding athlete perceptions of effective coaching behaviours and how they impact specific outcomes may help to improve positive development in youth athletes.

Over the past decade there has been considerable research into the effects of prior cognitive exertion on subsequent self-regulation of sport and exercise performance. In this chapter we provide an overview of how this body of literature has developed amongst two parallel, yet separate perspectives - self-control and mental fatigue – and where it currently stands. The prominent theories in the field are discussed and areas that warrant further investigation moving forward are highlighted. This includes discussion of factors known to mediate and moderate this relationship, and future directions that will help us elucidate underlying mechanisms.

Objectives: The COVID-19 crisis also affected elite sport severely, as elite athletes either stopped or drastically reduced their training regimen due to the lack of competitions and the mandatory lockdown. The aim of this study was to test whether heart rate variability was a reliable index of training load, which was dramatically altered due to the mandatory lockdown that occurred as a consequence of the COVID-19. Equipment and methods: Training (volume and intensity) and heart rate variability of sixteen professional male (n=8; body mass index = 22.2±2.0) and female cyclists (n=8; body mass index = 20.3±1.1) before (4 weeks), during (7 weeks), and after (4 weeks) the mandatory lockdown in Spain were monitored. Results: Individual analyses showed that the mandatory lockdown caused reliable reductions in training volume in 13 subjects (-96 to -7 % reductions in minutes), that were followed by an increase after the lockdown in all subjects (5 to 270%). In contrast, changes in training load were not homogenous across individuals. Moreover, such changes were not matched by comparable variations in heart rate variability. A mixed model of the heart rate variability as a function of training volume and intensity revealed no significant modulation by these two variables, and subject specific effects on the slope. In this study, we did not find evidence of association between heart rate variability and training load and/or intensity as many previous reports have suggested, even if training conditions changed dramatically overnight.

Mental fatigue can impart negative effects on subsequent physical performance, although the mechanisms underlying these effects are not well understood. This study examined whether mental fatigue confers negative carryover effects on the performance of a set of biceps curls, while also investigating physiological and psychological mechanisms proposed to explain the predicted effect. A randomized, cross-over design was employed. On visit 1, participants (N = 10) performed a barbell biceps curl one-repetition maximum (1RM) test. On visits 2–3, participants performed 20 biceps curls at 50% of their 1RM, followed by their respective 10 min experimental manipulation (high vs. low cognitive exertion) and then a second set of biceps curls to exhaustion. Ratings of perceived exertion and electromyography of the biceps brachii, triceps brachii, upper trapezius, thoracic erector spinae and lumbar erector spinae were recorded during the physical task. The total number of repetitions completed was similar across the conditions. Results also failed to show between-condition differences for muscle activation and perceptions of exertion. Future research is needed to build an adequate knowledge base to determine whether there is an effect of mental fatigue on dynamic resistance-based task performance and, if so, identify the mechanisms explaining how and why.

The present study examined the associations of physical fitness and motor competence with P3 and alpha desynchronization (ERD), two neuroelectric indices of brain development underlying controlled attention, in 4-6 year-old preschool children. All participants completed physical fitness and motor competence test batteries and an auditory oddball task while electroencephalogram (EEG) was recorded. Results revealed that increased muscular power, muscular endurance, physical fitness, and motor competence were associated better attentional task performance. Analysis on neuroelectric indices showed that muscular endurance was related to increased P3 amplitude, while the increases in physical fitness and motor competence were associated with greater upper alpha (10-12 Hz) ERD following the stimulus evaluation and response selection. Further, the negative associations of physical fitness and motor competence with task response time were mediated by the upper alpha ERD. These findings highlight the importance of early childhood motor competence and physical fitness, especially muscular endurance, to neurocognitive function.

Purpose: To investigate whether mild dehydration, as a weight reduction strategy for lightweight rowers, compromises rowing performance despite a two-hour rehydration window. Both 2000m time trial and visuomotor performance were assessed for impairment. Methods: Experienced rowers (N=14) twice performed a 2000 m rowing ergometer time trial and visuomotor battery: once euhydrated and once after mild dehydration (-1.68 ± .23% body mass reduction). Weight loss was achieved through a combination of 12-hour (overnight) fluid restriction and sauna exposure. Results: Participants were significantly slower on the 2000 m rowing trial in the dehydration condition than in the euhydration condition (2.44 ± 4.5 s, p

Objective To elucidate the muscle recruitment patterns and interindividual variability during co-contraction training sessions for lower limbs. Methods Ten active male young adults underwent two days of tests, in which they performed, for each leg, a maximal isometric voluntary contraction protocol followed by a co-contraction training set. We acquired myoelectric (EMG) activity from the sartorius, biceps femoris long and short heads, semitendinosus, semimembranosus, rectus femoris, vastus lateralis and vastus medialis and tensor facia latae during both protocols. We used iterative HLM analyses and bootstrap ANOVAs to explain within and between participant variances. Results On average, participants started recruiting 36% of their maximum EMG amplitude, showing decays of 0.41% per repetition and increasing 7.45% from day 1 to day 2. Participants who started with higher recruitment showed greater decays over repetitions and vice-versa. The training stimulated similarly the ratio of participants’ flexors and extensors. However, participants demonstrated different average muscle recruitment patterns with some individuals modifying, largely, their recruitment over repetitions/days. Between and within-variability in recruitment pattern was maintained throughout repetitions and days. We found no consistent similarity in terms of pairs of participants as to find common types of recruitment. Conclusion Co-contraction training seems to be effective to recruit thigh muscles of both legs along an entire set of repetitions and days. Despite the accounted variations in intramuscular recruitment, co-contraction training evokes similar muscular in flexor’s and extensor’s recruitment among participants.

Introduction: Musculoskeletal disorders have a significant global burden, with tendinopathies of the lower limb having a high prevalence. Although the use of resistance training interventions as treatment for tendinopathies has become widespread, the reporting and description of these interventions is often poor, preventing translation to clinical practice. Specific exercise description and intervention variables must be reported in order to translate research findings into clinical practice. This scoping review aims to summarise reporting of current resistance training interventions as assessed by the Consensus on Exercise Reporting Template and Toigo and Boutellier Framework.Methods and analysis: The recommended methodological framework described by the Joanna Briggs Institute will be used to structure this review, with reporting in accordance with the PRISMA-ScR. Databases to be searched include MEDLINE, CINAHL, AMED, EMBase, SPORTDiscus, Cochrane library (Controlled trials, Systematic reviews), JBI Evidence Synthesis, and five trial registries. Two independent reviewers will screen studies at title/abstract and full text. Following screening, data will be extracted and charted, then presented as figures and table alongside a narrative synthesis. Dissemination: This scoping review will evaluate current resistance training exercise descriptors and program variables in lower limb tendinopathy using recommended frameworks for the first time in the literature. The results will allow dissemination of the parameters of research exercise interventions to clinical practitioners through peer-reviewed publication and social media outlets, allowing implementation in clinical practice. The review will also outline future research and exercise reporting needs within tendinopathy resistance training interventions.

Background: The “athlete’s heart” has been well characterized, and it is known that remodeling is dependent on the nature of the hemodynamic-stimuli. Aquatic-athletes are exposed to hydrostatic pressures, postural anomalies, and breath-holds that likely drive distinct cardiac adaptation; however, the aquatic-athlete’s heart has not been specifically interrogated. The aim of this investigation was to characterize and compare the sport-specific cardiac structure of elite aquatic-athletes. Methods: Ninety athletes at the 2019 FINA World Championships from swimming (SW:20M/17F), water-polo (WP:21M/9F), and artistic swimming (AS:23F) volunteered for echocardiographic assessment of cardiac structure. Results: Male SW displayed primarily eccentric volume-driven remodeling, while male WP had a greater incidence of pressure-driven concentric geometry (SW:5%, WP:25%) with elevated relative wall-thickness (RWT) (SW:0.35±0.04, WP:0.44±0.08, P