Rest intervals during resistance training affect the rating-perceived exertion and muscle performance in untrained subjects.

Rest intervals of one to three minutes are recommended for novice and untrained subjects. However, the effect of these rest intervals on rating perceived exertion, repetitions performed, total training volume, and fatigue index has not been widely investigate. The aim of the present study was to compare the acute effect of short (1-min) versus long (3-min) rest intervals between sets and exercises on rating perceived exertion, repetitions performed, total training volume, and fatigue index in untrained subjects. Nine women and three men (age 20.7 ± 0.8 years, body mass 73.9 ± 19.3 kg, height 1.7 ± 0.1 m, body mass index 25.2 ± 5.3 kg/m2 and body fat 15.8 ± 6.0 %) were included in this study. After familiarization and 10RM for nine exercises (chest press, leg press, front lat pull down, seated leg extension, up right row, seated leg curl, triceps extension, calf rise and biceps curl), the subjects were randomized and performed a session using a counterbalanced order with 1- and 3-min rest intervals between sets and exercises separated by 5-7 days. All subjects performed 3 sets at intensity corresponding to 10 repetitions maximum. We measured rating perceived exertion and repetitions performed and calculate total training volume and fatigue index. 3-min rest intervals elicits lower RPE (Z=-5,638, P<0.0001, ES=0.86), and higher RP (Z=-6,547, P<0.0001, ES=0.67), TTV (Z=-4,066, P<0.0001, ES=0.12), and FI (Z=- 7,913, P<0.0001, ES=1.59) as compared with 1-min. For untrained subjects in the beginning of a training program, longer rest intervals recommended to avoid excessive exertion and may result in enhance training performance. [ABSTRACT FROM AUTHOR]

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