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We report on results from a World Climate Research Program workshop on representations ofscavenging and deposition processes in global transport models of the atmosphere. 15 modelswere evaluated by comparing simulations of radon, lead, sulfur dioxide, and sulfate against eachother, and against observations of these constituents. This paper provides a survey on the simulationdifferences between models. It identifies circumstances where models are consistent withobservations or with each other, and where they differ from observations or with each other. Thecomparison shows that most models are able to simulate seasonal species concentrations nearthe surface over continental sites to within a factor of 2 over many regions of the globe. Modelstend to agree more closely over source (continental ) regions than for remote (polar and oceanic)regions. Model simulations differ most strongly in the upper troposphere for species undergoingwet scavenging processes. There are not a sufficient number of observations to characterize theclimatology ( long-term average) of species undergoing wet scavenging in the upper troposphere.This highlights the need for either a different strategy for model evaluation (e.g., comparisons onan event by event basis) or many more observations of a few carefully chosen constituents.

Strength and conditioning specialists use upper-body push and pull patterns in an attempt to improve the force and/or velocity characteristics of the upper-body musculature. However, because of the influence faulty mechanics have on performance and th eprevalence of overuse injuries in sport and sport-specific training, screening an athlete's upper-body movement competency before extensive loading may provide insight into movement strategies that are inefficient and contribute to injury. [ABSTRACT FROM AUTHOR]

The lunge pattern is considered a fundamental movement pattern due to its occurrence in activities of daily living and sport-specific training. It is a pattern often used by sport medicine professionals and strength and conditioning specialists to improve proprioception and strength. The forward lunge has been established as an effect exercise for improving coordination and muscle balance to enhance performance in unilateral activities such as sprinting and change of direction. Due to the prevalence of the lunge patter in sport training, screening an athlete's lunge pattern before extensive loading of muscle occurs may be a best practice. [ABSTRACT FROM AUTHOR]

The squat pattern found in exercises such as the back squat, front squat, and dead lift are widely considered foundational exercises used by strength and conditioning professionals to improve strength and power. Before loading an athlete with various squat pattern exercises, screening an athlete's movement capability with a simple bodyweight bilateral squat may give valuable insight into an athlete's movement capability. Information obtained from a bodyweight bilateral squat screen may assist the strength and conditioning professional with developing safer more effective strength-training programs. [ABSTRACT FROM AUTHOR]

BASEBALL PITCHERS ARE SOME OF THE MOST EXPLOSIVE ATHLETES IN SPORTS. COLLEGIATE PITCHERS MAY BE CONSIDERED A STARTER, MIDDLE RELIEVER, OR CLOSER, YET THEY WILL OFTEN PITCH WHEN NEEDED. THE STRENGTH AND CONDITIONING PROFESSIONAL SHOULD CONSIDER THE WEEKLY DEMANDS PLACED ON A PITCHER AND DESIGN A STRENGTH AND CONDITIONING PROGRAM THAT (A) OPTIMIZES PERFORMANCE FOR EACH PITCHING OUTING, (B) REDUCES THE RISK OF INJURIES, AND (C) ATTENUATES DETRAINING DURING THE SEASON. THE RECOMMENDED PROGRAM UTILIZES CONDITIONING PROGRAMS BASED IN THE WEIGHT ROOM, IN THE ATHLETIC TRAINING ROOM, AND ON THE FIELD. [ABSTRACT FROM AUTHOR]

In this paper we examine the internal migratory response, by native-born non-Hispanic white men and foreign-born men in the United States, to recent immigration. Our analysis does not support the claim that natives have made a migratory response to recent immigration. Native-born men and foreign-born men were less likely to leave states that received large numbers of immigrants in the 1980s than they were to leave other states, and native-born men had less propensity toward out-migration than did foreign-born men. Out-migration was most likely to be deterred if recent immigrants originated in Europe or Asia. Although native-born non-Hispanic white men showed a tendency toward out-migration if recent immigrants originated in Latin America or the Caribbean, this result was insignificant after we controlled for state economic and regional context. [ABSTRACT FROM AUTHOR]

BackgroundThere is a large body of research suggesting that medical professionals have unmet information needs during their daily routines. ObjectiveTo investigate which online resources and tools different groups of European physicians use to gather medical information and to identify barriers that prevent the successful retrieval of medical information from the Internet. MethodsA detailed Web-based questionnaire was sent out to approximately 15,000 physicians across Europe and disseminated through partner websites. 500 European physicians of different levels of academic qualification and medical specialization were included in the analysis. Self-reported frequency of use of different types of online resources, perceived importance of search tools, and perceived search barriers were measured. Comparisons were made across different levels of qualification (qualified physicians vs physicians in training, medical specialists without professorships vs medical professors) and specialization (general practitioners vs specialists). ResultsMost participants were Internet-savvy, came from Austria (43%, 190/440) and Switzerland (31%, 137/440), were above 50 years old (56%, 239/430), stated high levels of medical work experience, had regular patient contact and were employed in nonacademic health care settings (41%, 177/432). All groups reported frequent use of general search engines and cited “restricted accessibility to good quality information” as a dominant barrier to finding medical information on the Internet. Physicians in training reported the most frequent use of Wikipedia (56%, 31/55). Specialists were more likely than general practitioners to use medical research databases (68%, 185/274 vs 27%, 24/88; χ22=44.905, P

Introduction: Increases in computed tomography (CT) use may not always reflect clinical need or improve outcomes. This study aimed to demonstrate how population level data can be used to identify variations in care between patient groups, by analysing system-level changes in CT use around the diagnosis of new conditions., Methods: Retrospective repeated cross-sectional observational study using West Australian linked administrative records, including 504,723 adults diagnosed with different conditions in 2006, 2012 and 2015. For 90 days pre/post diagnosis, CT use (any and 2+ scans), effective dose (mSv), lifetime attributable risk (LAR) of cancer incidence and mortality from CT, and costs were assessed., Results: CT use increased from 209.4 per 1000 new diagnoses in 2006 to 258.0 in 2015; increases were observed for all conditions except neoplasms. Healthcare system costs increased for all conditions but neoplasms and mental disorders. Effective dose increased substantially for respiratory (+2.5 mSv, +23.1%, P < 0.001) and circulatory conditions (+2.1 mSv, +15.4%, P < 0.001). The LAR of cancer incidence and mortality from CT increased for endocrine (incidence +23.4%, mortality +18.0%) and respiratory disorders (+21.7%, +23.3%). Mortality LAR increased for circulatory (+12.1%) and nervous system (+11.0%) disorders. The LAR of cancer incidence and mortality reduced for musculoskeletal system disorders, despite an increase in repeated CT in this group., Conclusions: Use and costs increased for most conditions except neoplasms and mental and behavioural disorders. More strategic CT use may have occurred in musculoskeletal conditions, while use and radiation burden increased for respiratory, circulatory and nervous system conditions. Using this high-level approach we flag areas requiring deeper investigation into appropriateness and value of care., (© 2024 The Author(s). Journal of Medical Radiation Sciences published by John Wiley & Sons Australia, Ltd on behalf of Australian Society of Medical Imaging and Radiation Therapy and New Zealand Institute of Medical Radiation Technology.)

Objective: We aimed to determine what older adults perceive to be need-supportive behaviours of peer walk leaders, drawing primarily from Self-Determination Theory (SDT)., Design: Experienced peer leaders ( n  = 13; M age = 73.23, SD  = 6.55) and walkers ( n  = 17; M age = 72.88, SD  = 5.79) were recruited from existing walking groups. Individuals who expressed an interest in becoming a peer leader ( n  = 18; M age = 72.72, SD  = 4.99) or walker ( n  = 20; M age = 78.90, SD  = 10.45) were recruited from retirement villages., Main Outcome Measures: We conducted semi-structured interviews to identify leader behaviours that support autonomy, competence, and relatedness and analysed the data using framework analysis., Results: We identified eight main themes: eliciting walker interest, acknowledging and adapting to walkers' requirements, ensuring walkers feel comfortable, cared for, and socially integrated, supporting walker confidence, and promoting success experiences. Inexperienced leaders differed from other sub-groups in what they perceived to be supportive behaviours., Conclusion: Future peer leaders could use the identified behaviours to help older adults feel motivated during group walks. New peer leaders can be educated about potential differences between what they describe as supportive and what walkers and experienced leaders perceive as need-supportive behaviours.

Background: Physical activity (PA) is beneficial for older adults' health, however they remain the least active age group in the UK. This qualitative longitudinal study aims to understand motivations in older adults receiving the REACT physical activity intervention, through the lens of self-determination theory., Methods: Participants were older adults randomised to the intervention arm of the Retirement in ACTion (REACT) Study, a group-based physical activity and behaviour maintenance intervention to prevent decline of physical functioning in older adults (≥ 65 years). Stratified purposive sampling by physical functioning (Short Physical Performance Battery scores) and 3-month attendance was employed. Fifty-one semi-structured interviews were conducted at 6, 12 and 24-months with twenty-nine older adults (Mean age (baseline) = 77.9 years, SD 6.86, 69% female) and at 24-months with twelve session leaders and two service managers. Interviews were audio recorded, transcribed verbatim and analysed using Framework Analysis., Results: Perceptions of autonomy, competence and relatedness were associated with adherence to the REACT programme and maintenance of an active lifestyle. Motivational processes and participants' support needs, changed during the 12-month REACT intervention and across the 12-months post-intervention. Group interactions were an important source of motivation during the first six months but increased competence and mobility drove motivation at the later stages (12 months) and post-intervention (24 months)., Conclusions: Motivational support needs vary in different stages of a 12-month group-based programme (adoption and adherence) and post-intervention (long-term maintenance). Strategies to accommodate those needs include, (a) making exercise social and enjoyable, (b) understanding participants' capabilities and tailoring the programme accordingly, (c) capitalising on group support to motivate participants to try other activities and prepare sustainable active living plans., Trial Registration: The REACT study was a pragmatic multi-centre, two-arm, single-blind, parallel-group, RCT (ISRCTN registration number 45627165)., (© 2023. The Author(s).)

This qualitative research explored older adults' perceptions of participating in group-based walking programs set in independent-living retirement village contexts. Semistructured interviews were conducted with a subset of participants from the Residents in Action Trial. Data were analyzed through a combination of deductive and inductive thematic analysis. Findings were interpreted from a social identity perspective. Five themes were identified: (a) varying levels of social cohesion in retirement villages; (b) degree of shared identity between residents; (c) health, mobility, and preferred pace; (d) devotion to spouse; and (e) busy lives. When designing group-based walking interventions in retirement villages, it is important to consider community-level social cohesion and degree of relatedness between village residents. When attempting to build a sense of shared identity and relatedness between group members, researchers and policy makers should consider differing backgrounds, capabilities, schedules, and interests of participants.

Background and Objectives: Peer volunteers offer a promising avenue for promoting physical activity in older adults. However, recruiting and retaining such volunteers are challenging. We aimed to examine longitudinally factors that determine whether older volunteer walk leaders will persist in their role., Research Design and Methods: We recruited older adults volunteering as walk leaders, from retirement villages in Perth, at the start of a 16-week walking intervention. Using a mixed-methods multiple case study design, informed by self-determination theory, we examined the motivational processes of three profiles: Dropouts, Completers, and Extenders. One male and 10 female (medianAge = 75 years, age range: 66-83 years) peer walk leaders were interviewed twice over 4 months, and data were analyzed using thematic analysis. Questionnaires provided information on volunteer characteristics, leadership confidence, and volunteer motivation., Results: Self-orientated goals, obligation and guilt, emotional exhaustion, lack of psychological need satisfaction, and perceived lack of support were barriers to volunteer persistence. Social confidence and relatedness satisfaction motivated volunteers to persist until program completion (Completers). Altruistic goals, using sustainable helping strategies, psychological need satisfaction, optimism, and enjoyment were important for continuing the role after the program (Extenders)., Discussion and Implications: Results describe how differences in volunteer motives, personal characteristics, and training may affect motivational processes that determine persistence as an older peer walk leader. We provide suggestions on selecting, training, and supporting older volunteer walk leaders to facilitate their retention., (© The Author(s) 2020. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

The authors examined whether purposeful walking with peers at least once a week contributes to better behavioral and health outcomes in older adults than primarily walking alone. The authors used a longitudinal cohort design and recruited participants aged 60 years and older (N = 136) at the start of a 16-week walking intervention. Participants who walked on average at least once a week in the final 8 weeks of the intervention were included in the analysis (N = 79; 66 females, Mage [SD] = 77.73 [6.91]). The authors found that autonomous motivation, walking self-efficacy, functional capacity, body fat, and physical activity improved more in the walking with peers group compared with the walking alone group, after controlling for whether participants lived alone/with others and their health status. The results extend current literature by providing longitudinal evidence for the added benefits of regular peer-accompanied walking in older adults and highlight the importance of investing in peer-supported interventions.

Background: Successful peer volunteering is central to many community-based, active ageing initiatives. This study synthesises the perspectives of a range of stakeholders involved in peer volunteering initiatives and provides recommendations as to how peer volunteers can be effectively mobilised as community assets., Methods: An evidence synthesis of qualitative data from (a) the evaluation of ACE (Active, Connected, Engaged), a feasibility trial of a peer volunteering active ageing intervention, and (b) interviews with volunteers and managers of third sector organisations providing peer volunteering programmes. Data were analysed using directed content analysis., Results: Ten managers, 22 volunteers and 20 ACE participants were interviewed. The analysis identified six main themes, 33 higher and 22 sub themes. Main themes were: (i) Motives, (ii) Benefits, (iii) Skills and Characteristics, (iv) Challenges, (v) Training Needs, (vi) Recruitment and Retention. Altruism, changes in life circumstances, opportunities to reconnect with the community and personal fulfilment were the main reasons for volunteering. Volunteering was described as being personally rewarding, an avenue to acquire new skills and knowledge, and an opportunity for increased social connections and physical activity. Good peer volunteers are committed, reliable, have a good sense of humour, good interpersonal skills and are able to relate to participants. When pairing volunteers with participants, shared interests and geographical proximity are important to consider. Clarity of role, level of time commitment, regular feedback, recognition of effort and strong networks for on-going support are important strategies to facilitate volunteer retention., Conclusions: The findings of this study support the value of peer volunteering as a strategy for mobilising community assets in promoting active ageing. To ensure success and longevity, these schemes require appropriate funding and efficient administrative support.

Background and Objectives: Peer-led interventions are promising for the promotion of physical activity behavior in older adults. However, little is known about the attributes of effective older peer leaders in such intervention programs. The objective was to determine what older adults perceive to be effective peer leader attributes., Research Design and Methods: A mixed-methods concurrent triangulation design was used. Participants, aged 60 years and older, were recruited from retirement villages and existing walking groups in Western Australia. They were predominantly white, Australian-born, female, healthy retirees. The sample consisted of four groups of older adults: those who had taken part in past peer-led walking programs (experienced walkers; n = 18), those interested in joining as walkers in a peer-led walking intervention (inexperienced walkers; n = 43), those interested to take on a peer leader role (inexperienced peer leaders; n = 25), and those who had already served as peer leaders (experienced peer leaders; n = 15). Questionnaires measured perceived effective leadership attributes, and physical activity was measured using ActivPAL devices (N = 101; Mage [SD] = 75.36 [7.59]). Semistructured interviews were conducted with the majority of participants (N = 68; Mage [SD] = 74.68 [7.78])., Results: Overall, participants described an effective peer leader as optimistic, compassionate, and friendly, but differences in perceptions were apparent between the groups., Discussion and Implications: Our findings advance knowledge about important characteristics of an effective older peer leader, which can inform peer leader training, recruitment of peer leaders, and future scale development., (© The Author(s) 2020. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Objective : The Residents in Action Trial (RiAT; ACTRN12616001177448) was a 16-week motivationally-embellished peer-led walking intervention designed to increase walking, reduce sitting, and improve mental health and well-being in insufficiently active residents in retirement villages. In this paper we report on 1) trial feasibility and acceptability, and 2) evaluate the processes involved in the implementation of the intervention using the RE-AIM framework. Method : A mixed methods design was employed, consisting of data from accelerometers, surveys, (individual, pair-based and focus group) interviews, and participant logbooks. Participants included 116 walkers ( M ( SD ) age = 78.37(8.30); 92% female), 8 peer leaders (i.e. ambassadors) and 3 retirement village managers from 14 retirement villages. Descriptives and linear mixed modelling were used to analyse the quantitative data and inductive thematic analyses were employed to analyse the interview data. Results : The intended cluster randomised controlled design became quasi-experimental due to insufficient numbers of recruited ambassadors. The perceived burden of the number and frequency of research assessments was a frequently mentioned reason for a poor recruitment. Facilitators to walking maintenance were the use of self-monitoring, goal setting, social support, and having a routine. Reach was modest (about 14% of eligible participants were recruited from each village), but retention was excellent (92%). The motivational strategies taught appeared to have been implemented, at least in part, by the ambassadors. The walkers in the main experimental condition increased marginally their step counts, but there were no group differences on mental health and well-being outcomes, partly because of low statistical power. Conclusions : Walkers and ambassadors who did take part in the study suggested that they enjoyed the programme and found it useful in terms of becoming more active and making social connections. However, the group format was not appealing to some participants, hence, other delivery options should be explored in the future., Competing Interests: No potential conflict of interest was reported by the authors., (© 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.)

Medical professionals frequently face unmet information needs during their daily routines. We investigated the use of web search engines through a large-scale survey including 500 European physicians, as well as local user testing that observed the search behavior of physicians when facing clinical questions. We identified several differences in the search requirements and behaviors of different groups of physicians based on level of qualification and level of specialization. We also found user testing a valuable source of information about the search preferences of medical professional. The survey and user tests we conducted are among the largest and most detailed that have been conducted in this domain.

Are immigrants who live in states where large numbers of their compatriots reside more or less likely to migrate than those who live in other states? Using 1980 U.S. Census data to address that question, the analysis shows that nativity concentration deters interstate migration but not migration within the same state. Residing in a state where fellow nationals live is a more important determinant of internal migration than human capital, immigration status, or a state's unemployment rate. New York State residence in 1975 also promotes interstate migration. This research suggests that social dimensions should be taken into account in modeling internal migration of the foreign-born.

Correlative aerosol measurements taken at a limited number of altitudes during coordinated field experiments are used to test the validity of particulate extinction coefficients derived from limb path solar radiance measurements taken by the Stratospheric Aerosol and Gas Experiment (SAGE) II Sun photometer. In particular, results are presented from correlative measurement missions that were conducted during January 1985, August 1985, and July 1986. Correlative sensors included impactors, laser spectrometers, and filter samplers aboard an U-2-airplane, an upward pointing lidar aboard a P-3 airplane, and balloon-borne optical particle counters (dustsondes). The main body of this paper focuses on the July 29, 1986, validation experiment, which minimized the many difficulties (e.g., spatial and temporal inhomogeneities, imperfect coincidences) that can complicate the validation process. On this day, correlative aerosol measurements taken at an altitude of 20.5 km agreed with each other within their respective uncertainties, and particulate extinction values calculated at SAGE II wavelengths from these measurements validated corresponding SAGE II values. Additional validation efforts on days when measurement and logistical conditions were much less favorable for validation are discussed in an appendix.