Effects of rest interval between sets of resistance training on post-exercise hypotensive response in normotensive young men / Efeitos de diferentes intervalos de recuperação entre séries de exercícios resistidos na hipotensão pós-exercício

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Studies have indicated that even an acute bout of resistance training (RT) may elicit decreases in blood pressure after the exercise session. This effect is known as post-exercise hypotension (PEH) and may have the potential to act as a non-pharmacological aid in the treatment of hypertension. Manipulation of RT variables may influence the magnitude and duration of this effect. Studies have investigated the effect of exercise intensity, exercise order, and exercise volume on PEH. However, we are unaware of any published studies analyzing the effects of RT rest interval (RI) on PEH. Thus, the purpose of the present study is to evaluate the effect of three different RI between sets during a traditional RT session on PEH in normotensive young men. Methods: Sixteen normotensive young (22.88 3.12 yrs) healthy sedentary men participated in the study protocol. On four separate occasions, subjects were assigned in a random order to perform one session RT protocol at either 1 (P1), 2 (P2) or 3 (P3) minutes between the set RI, and one control session protocol (CON). The resistance exercise session consisted of six RT exercises with 3 sets of 8 repetitions. To maintain the same total work output due to the differences between RI, the load were set at 80, 70 and 60% of 1RM for the 1st, 2nd, and 3rd sets respectively for the leg press, bench press, seated row, and leg curl exercises, and at 70, 60 and 50% for the arm curl and arm extension. To determine the load used on the RT protocol, two 1 RM testing were performed. The blood pressure was assessed trough a Microlife 3AC1-1 monitor at moments: 1) rest (R); 2) 15 minutes after session (T15); 3) 30 minutes after session (T30); 4) 45 minutes after session (T45); 5) 60 minutes after session (T60); 6) 75 minutes after session (T75) and 7) 90 minutes after session (T90). Statistical evaluation of the data was measured using a 4 x 7 repeated measures analysis of variance [protocol (CON, P1,P2, P3) x time (R, T15, T30, T45, T60, T75, T90)] with Least-significant difference (LSD) post-hoc procedure for all blood pressure measurements. The probability level of statistical significance was set at p <0.05 in all comparisons. Results: Comparing to baseline (R), no significant systolic blood pressure (SBP) PEH was observed after protocols (P1,P2, P3 and CON). However, after P1 and P3 the diastolic blood pressure (DBP) dropped significantly (p<0.05) comparing to rest values. The PEH in DBP remained for 30 minutes after P1 and 15 minutes after P3. The comparison between protocols (P1, P2, P3 and CON) revealed that the SBP after CON was significantly (p<0.05) higher at T45 than all protocols. The DBP after CON remained significantly increased (p<0.05) in comparison with P1, P2 and P3 for 45, 45 and 30 minutes respectively. Conclusions: The results of the present study demonstrate no effect of different RI on the PEH after RT in untrained young male. However, a PEH in DBP was demonstrated after all RT protocols.

ASSUNTO(S)

hipotensão pós-exercício exercícios resistido educacao fisica intervalos de recuperação resistance training, post-exercise hypotension, rest interval

ACESSO AO ARTIGO

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