Search

Resistance-type exercise (RE) elicits distinct acute metabolic and hormonal responses, which can be modulated by the manipulation of training variables. The purpose of this study was to compare the metabolic (blood lactate and estimated lactic anaerobic system energy expenditure) and hormonal (growth hormone [GH]) responses to RE sessions composed exclusively of multijoint (MULTI) or single-joint (SINGLE) exercises. Assessments of creatine kinase (CK) levels were also performed. In a crossover design, 10 recreationally resistance-trained men (age: 26.9 ± 3.0 years, total body mass: 83.2 ± 13.8 kg; height: 176 ± 7.0 cm; training experience: 5.5 ± 2.4 years) were randomly submitted to both protocols. Blood collections were made pre, 3 minutes after, and 36 hours after each experimental session. No significant difference between MULTI vs. SINGLE was observed for the rises in blood lactate (p = 0.057) and GH (p = 0.285) levels. For CK, a significant difference between the protocols was noted, in which MULTI resulted in significant rises after 3 minutes (p = 0.017) and 36 hours (p = 0.043) compared with SINGLE. In conclusion, the findings of this study suggest that resistance-trained individuals display similar metabolic and hormonal responses when performing MULTI and SINGLE exercise protocols. Also, RE sessions comprising MULTI exercises induce a higher magnitude of muscle damage, which may require a longer recovery period compared with SINGLE. [ABSTRACT FROM AUTHOR]

This study aimed to test the reproducibility of the 3-min all-out effort applied using shuttle running and compare its values to aerobic parameters. On the first day, 14 futsal players underwent an exhaustive test to determine the maximal incremental speed (MIS) and anaerobic threshold (AnT). On the second day, the participants performed the 3-min all-out effort (n=14), which was repeated after 48 h (third day) to test its reproducibility (n=11). Peak oxygen consumption (V̇ O2PEAK) and peak blood lactate concentrations ([La-]) were determined from 3-min all-out efforts performed through a 20-m shuttle run on the official court. The distance covered, mean speed, and critical speed (CS) during the 3-min all-out presented direct relationships with aerobic parameters determined through the incremental test (r>0.62). The distance covered above CS (D') presented a direct relationship with peak lactate concentrations induced by a 3-min all-out effort (r=0.81). Despite the acceptable levels of reproducibility observed for most of the 3-min all-out variables, the minimal detectable change for D' was high (72%). Our results demonstrated the potential use of mean speed to evaluate aerobic fitness. However, the applicability of the 3-min all-out shuttle run test to monitor training adaptations should be avoided, at least in nonexperienced athletes. [ABSTRACT FROM AUTHOR]

The relationship between performance in physical tests and the match intensity from the heart rate (HR) response has not been studied in soccer. Thus, this study aimed to verify the correlation between the performance in physical tests and the intensity of the soccer match. Eleven Under-20 soccer players from the first division were evaluated in 2 official matches. The Yo-Yo intermittent aerobic test level 1 (YYIR1), 10-m and 30-m speed, repeated sprints ability (RSA, 6 x 20-20 m), the squat (SJ) and countermovement (CMJ) jump tests were performed. The heart rate (HR) was used to calculate the impulse training (M-TRIMP) by Edwards's methods, and the time spent above 90% of HRmax (HR>90%) was considered a high-intensity parameter. Pearson's correlation was applied, considering the significance level of p < 0.05. Significant correlations occurred between YYIR1 and M-TRIMP (r = 0.72) and the time in HR>90% (r = 0.51) and between the best time in RSA (RSAbest) and HR>90% (r = -0.50). YYIR1 was the best test related to the match intensity measured by the HR. RSAbest was also a good high-intensity indicator of the match, while jump and speed tests were not. [ABSTRACT FROM AUTHOR]