RESUMO
The aim of this study was to examine the effect of adding single-joint (SJ) exercises to a multi-joint (MJ) exercise resistance-training program on upper body muscle size and strength. Twenty-nine untrained young men participated in a 10-week training session. They were randomly divided in 2 groups: the MJ group performed only MJ exercises (lat pulldown and bench press); the MJ+SJ group performed the same MJ exercises plus SJ exercises (lat pulldown, bench press, elbow flexion, and elbow extension). Before and after the training period, the muscle thickness (MT) of the elbow flexors was measured with ultrasound, and peak torque (PT) was measured with an isokinetic dynamometer. There was a significant (p < 0.05) increase in MT (6.5% for MJ and 7.04% for MJ+SJ) and PT (10.40% for MJ and 12.85% for MJ+SJ) in both groups, but there were no between-group differences. Therefore, this study showed that the inclusion of SJ exercises in a MJ exercise training program resulted in no additional benefits in terms of muscle size or strength gains in untrained young men.
Assuntos
Força Muscular , Músculo Esquelético , Exercício Físico , Humanos , Hipertrofia , Treinamento ResistidoRESUMO
O objetivo foi avaliar os efeitos de treinamento isocinético de curta duração no desempenho muscular em indivíduos jovens. Onze homens sadios participaram de um programa de treinamento isocinético de curta duração, composto por 3 sessões (4 séries; 10 repetições isocinéticas concêntricas a 120°.s-1; 2 minutos de intervalo entre séries). A reprodutibilidade dos dados de 2 sessões foi avaliada pelo coeficiente de correlação intraclasses (CCI) e teste de Bland e Altman. As avaliações do treinamento foram aplicadas pré e pós a 2ª e 3ª sessões (1 série; 3 repetições concêntricas de extensão do joelho a 60°.s-1, 120°.s-1 e 180°.s-1). Utilizou-se a ANOVA para medidas repetidas e post-hoc de Tukey para verificar diferenças nos testes. O CCI variou de 0,97 a 0,98 em todas as velocidades. Ocorreu um aumento no pico de torque a 60°.s-1 (P=0,03) e 120°.s-1 (P=0,01) após 2 sessões de treinamento. Sugere-se que duas sessões de exercício isocinético foram suficientes para induzir ganhos de força na velocidade treinada (120°.s-1) e em velocidade de contração mais lenta (60°.s-1), em indivíduos jovens.
The aim was to investigate the effects of short-term isokinetic training on muscle performance in young individuals. Eleven healthy males subjects underwent to short-term training, consisting of 3 sessions (4 sets, 10 repetitions of concentric isokinetic exercise at 120°.s-1; 2-minute interval between sets). Data reproducibility from two sessions was evaluated by intraclass correlation coefficient (ICC) and Bland and Altman test. Training assessments were made pre and post the 2nd and 3rd sessions (1 set, 3 repetitions of concentric knee extension at 60°.s-1, 120°.s-1 and 180°.s-1). An ANOVA for repeated measures and Tukey post-hoc test was applied to determine differences between tests. The ICC ranged from 0.97 to 0.98 for all velocities. There was an increase in peak torque at 60°.s-1 (P=0,03) and 120°.s-1 (P=0,01) after 2 training sessions. Two sessions of isokinetic exercise were sufficient to induce strength increases at the training velocity (120°.s-1) and the slower contraction velocity (60°.s-1) in young individuals.