Objective: The aim of the present study was to determine the change in velocity in young soccer players during the competitive period and its relation to the training content. Method: Participants were 17 soccer players (16.3 ± 0.4 years old, 70.2 ± 6.1 kg, 176 ± 6.4 cm). The team was analyzed for 17 weeks during competitive period. Evaluations were made of the velocity at 10 m (V10 m) and 30 m (V30 m) in three distinct moments (M1= 1st, M2= 10th and M3= 17th week). Results: The main results show a significant decrease (p < 0.05) of M1 (7.25 ± 0.2 m/s) to M3 (7.05 ± 0.2 m/s) for variable V30 m and significant increase in V10 m. Conclusion: We conclude that the applied training in the competitive period analyzed for V10 m caused a significant improvement and a decrease in V30 m for young soccer players in the study.

Objetivo: O presente estudo busca determinar a alteração da velocidade em jovens futebolistas no período competitivo e sua relação com o conteúdo de treinamento. Método: Participaram da pesquisa 17 jovens futebolistas (16.3 ± 0.4 anos, 70.2 ± 6.1 kg, 176 ± 6.4 cm). A equipe foi analisada durante 17 semanas no período competitivo de treinamento. Foram realizadas avaliações da velocidade em 10 m (V10 m) e 30 m (V30 m) em 3 momentos distintos (M1 = 1ª, M2 = 10ª e M3 = 17ª semana do estudo). Resultados: Os principais resultados apontam decréscimo significativo (p < 0.05) de M1 (7.25 ± 0.20 m/s) para M3 (7.05 ± 0.20 m/s) para a variável V30 m e sensível aumento em V10 m. Conclusão: Conclui-se que o treinamento aplicado no período competitivo analisado provocou melhoria sensível para V10 m e decréscimo para V30 m para os jovens futebolistas do estudo.

Objetivo: El presente estudio pretendió determinar las alteraciones de la velocidad en jóvenes jugadores de fútbol durante periodo competitivo y su relación con el contenido del entrenamiento. Método: Participaron 17 jugadores (16.3 ± 0.4 años, el 70.2 ± 6.1 kg, 176.0 ± 6.4 cm). El equipo fue analizado durante 17 semanas en periodo competitivo. Se realizaron evaluaciones de la velocidad a 10 m (V10 m) y 30 m (V30 m) en 3 momentos distintos (M1 = 1ª, M2 = 10ª y M3 = 17ª semana del estudio). Resultados: Los principales resultados muestran una disminución significativa (p < 0.05) de M1 (7.25 ± 0.20 m/s) en comparación con M3 (7.05 ± 0.20 m/s) para V30 m y un sensible aumento de V10 m. Conclusión: Se concluye que el entrenamiento aplicado en periodo competitivo analizado ha provocado una mejora significativa de V10 m y una disminución de V30 m en jóvenes futbolistas del estudio.

Centrally stimulated sweat rate produced by graded exercise until exhaustion was compared to the local sweat rate induced by pilocarpine, often used as a sweating index for healthy individuals. Nine young male volunteers (22 ± 4 years) were studied in temperate environment in two situations: at rest and during progressive exercise with 25 W increases every 2 min until exhaustion, on a cycle ergometer. In both situations, sweating was induced on the right forearm with 5 ml 0.5% pilocarpine hydrochloride applied by iontophoresis (1.5 mA, 5 min), with left forearm used as control. Local sweat rate was measured for 15 min at rest. During exercise, whole-body sweat rate was calculated from the body weight variation. Local sweat rate was measured from the time when heart rate reached 150 bpm until exhaustion and was collected using absorbent filter paper. Pharmacologically induced local sweat rate at rest (0.4 ± 0.2 mg cm-2 min-1) and mean exercise-induced whole-body sweat rate (0.4 ± 0.1 mg cm-2 min-1) were the same (P > 0.05) but were about five times smaller than local exercise-induced sweat rate (control = 2.1 ± 1.4; pilocarpine = 2.7 ± 1.2 mg cm-2 min-1), indicating different sudorific mechanisms. Both exercise-induced whole-body sweat rate (P < 0.05) and local sweat rate (P < 0.05) on control forearm correlated positively with pilocarpine-induced local sweat rate at rest. Assuming that exercise-induced sweating was a result of integrated physiological mechanisms, we suggest that local and whole-body sweat rate measured during graded exercise could be a better sweating index than pilocarpine.