Cardiovascular response in strenght training using diferents rest intervals/Respostas cardiovasculares agudas ao treinamento de forca utilizando diferentes intervalos entre series

This study aimed to determine the acute effect of different rest intervals between sets on the hemodynamic responses in normotensive subjects submitted to a strength training session. Ten men (22 ± 3.14 years; 1.77 ± 0.09 m; 73.12 ± 5.43 kg) experienced at least two years in strength training. Each subject took a leg extension in two different sessions at rest intervals of 1 and 3 minutes. They performed 4 sets of 80% of 10RM in each session. The heart rate increased during the sets progressed, though there was no difference significantly between the two protocols for this variable. Systolic blood pressure increased from rest to the first set in the two protocols, and from there, there was a tendency to stabilize the same. There were not significant differences between to two protocols. In both protocols the rate-pressure product (RPP) increased from rest to the first set, but there were significant difference between two protocols only to the fourth set. The results show that there was no significant difference between the protocols for the variables studied, except for the fourth set of RPP, which showed higher in group that had 1 minute of rest interval. Key words: strength training, cardiovascular response, rest interval O objetivo do presente estudo foi verificar o efeito agudo de diferentes intervalos entre series sobre as respostas cardiovasculares em individuos normotensos submetidos a duas sessoes de treinamento de forca. Participaram do estudo 10 homens (22 ± 3,14 anos; 1,77 ± 0,09m; 73 ± 5,43 kg) com no minimo dois anos de experiencia em treinamento de forca. Cada individuo realizou a cadeira extensora em duas sessoes diferentes com intervalos de 1 e 3 minutos em quatro series com carga a 80% de 10RM. A frequencia cardiaca aumentou na medida em que as series progrediram, mas nao houve diferencas significativas entre os dois protocolos. A pressao arterial sistolica aumentou do repouso para a primeira serie nos dois protocolos, com tendencia a estabilizacao nas series subsequentes, porem sem diferenca significativa. Em ambos os protocolos o duplo-produto (DP) aumentou do repouso para a primeira serie, com diferenca significativa para o intervalo de 1 minuto na quarta serie. Os resultados demonstraram diferenca significativa no DP com maiores valores na quarta serie no grupo que realizou o intervalo de 1 minuto, enquanto que nas outras variaveis nao foram verificadas diferencas significativas. Palavras-chave: treinamento de forca, resposta cardiova