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The aims of the study were: 1) to analyze the exercise intensity in several phases (six phases of 15 min) of soccer matches; 2) to compare the match time spent above anaerobic threshold (AT) between different age groups (U-17 and U-20); and 3) to compare the match time spent above AT between players’ positions (backs, midfielders, forwards and wingabcks). Forty-four male soccer players were analyzed. To express players’ effort, the heart rate (HR) was continuously monitored in 29 official matches. Further, HR corresponding to the intensity at the onset of blood lactate accumulation (OBLA) was obtained in a field test. The highest exercise intensity during match was observed in the 15-30 min period of the first half (p< 0.05). Match time spent above AT was not different between players from U-17 and U-20. In the comparison among players’ positions, wingbacks showed lower time above AT (p< 0.05) than players of other positions. The intensity of effort is higher in the 15 to 30 minutes of play (intermediate phase), probably because the players are more rested in the beginning and wearing out is progressive throughout the game. It is also noteworthy that the intensity of exercise (HR and time above AT) of wingbacks was lower, probably because they usually are required to run a larger number of sprints and need more time below the AT to recover.

Exercise intensity monitoring has been essential for the control and planning of sports training. Thus, the aim of the present study was to assess the chronic physiological demand of soccer players during an annual soccer season using blood biomarkers. Ten professional soccer players (21.2 ± 3.7 years) participated in this study. Blood samples were collected on the day before beginning of preseason (C1); at the end of preseason and beginning of competitive calendar (C2); and at the end of the competitive calendar. Interleukin-6 (IL-6), cortisol, testosterone, testosterone/cortisol ratio, creatine kinase and alpha-actin were evaluated. Statistical analysis was performed by using ANOVA with repeated measures and the post-hoc Tukey’s test. Significance level was set at P

Physical exercises can result in tissue damage on the muscular system, including during the preseason, which is a period of physical training aiming subsequent competitions. The aim of this study was to analyze the behavior of plasma CK as a marker of muscle damage during preseason of a professional soccer team; determine when preseason CK levels reach their peak value; and verify CK concentration on preceding moment to the first official match of the season. Professional soccer players (n = 31) attended this study (24.3 ± 3.9 years, 181.0 ± 7.0 cm, 9.1 ± 1.3%GC and 66.0 ± 4.5 mLO2/kg/min). The plasma concentration of CK was determined at the beginning of the preseason (M1), 4 (M2), 10 (M3) and 15 (M4) days after. We identified CK values of 178.2 ± 12.0, 540.0 ± 59.1, 389.8 ± 49.5, 408.7 ± 45.0 U/L for M1, M2, M3 and M4 respectively. The peak concentration of CK occurred on M2 (p

O teste de uma repetição máxima (1-RM) é frequentemente aplicado para medir a força de um indivíduo em um determinado exercício. O objetivo do presente estudo foi comparar o efeito de diferentes intervalos entre as tentativas do teste de 1-RM no desempenho de força máxima em mulheres no exercício leg press 45°. Para tanto, 12 voluntárias (19 ± 1 ano) praticantes de exercícios resistidos há no mínimo seis meses foram submetidas a quatro sessões de testes, alternadas por no mínimo 48 horas de repouso. Os intervalos de recuperação entre as tentativas do teste de 1-RM foram de 30, 45, 60 e 180 segundos, sendo que a ordem de execução foi definida aleatoriamente. Para identificação da diferença entre os intervalos propostos foi aplicada a análise de variância ANOVA One-way (p < .05). Os resultados não revelaram diferenças significativas no desempenho de força máxima em mulheres, quando comparados os valores médios de teste obtidos em cada um dos intervalos propostos. Esses achados indicam que para a medida de força máxima no exercício leg press 45°, intervalos menores do que um minuto (30 - 45 segundos) podem ser utilizados com a mesma precisão que intervalos maiores, garantindo maior economia de tempo para a aplicação do teste de 1-RM.