There is a lack of studies using inter-repetition rest periods in the upper and lower muscle groups on the sustainability of repetition. The purpose of this study was to compare the effect of three different interrepetition rest periods on the sustainability of bench and leg press repetition over four consecutive sets that were performed with 75% of one repetition maximum. Twenty resistance-trained college-age men participated in four testing sessions which involved the determination of one repetition maximum (first session) and the performance of four sets of bench presses and leg presses to exhaustion at 75% of 1RM load with inter-repetition rest periods of 0, 2 and 4 seconds (during the next three testing sessions). A zero-second inter-repetition rest period resulted in significantly greater sustainability of bench press and leg press repetitions compared to 2 and 4 second inter-repetition rest periods (BP: 9.27±2.15, 7.78±1.27, 7.78±1.3, LP: 9.87±1.49, 8.77±1.02, 8.96±1.46, respectively, p
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