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An age-related decrease in muscular strength may have a detrimental effect on muscle fatigue and recovery. To date, only one study has determined the effect of varied rest intervals (RI) between exercise sets in active younger and older women. They reported that active younger and older women require similar RI between sets to recovery full isokinetic knee extension peak torque (PT). However, we are unaware of any published studies comparing RI PT recovery between younger and older men. Thus, the purpose of this study was to compare the effect of two different RI's between sets of isokinetic knee extension exercise on PT, and Total Work (TW) between untrained younger and older men.
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18 young men (24.22 ± 2.58 yrs) and 20 older men (66.85 ± 4.02 yrs) performed 3 sets of 10 unilateral isokinetic knee extension repetitions at 60°/s. The rest intervals between sets were 1 and 2 minutes and were counterbalanced across 2 testing days, separated by a minimum of 48 hours. The work-to-rest ratio was 1:3 and 1:6. All subjects were not involved in exercise programs that included resistance exercises within the last 6 months. Statistical evaluation of the data was performed using a 2x 2 x 3 mixed factor repeated measures ANOVA [age (younger and older) x rest interval (1 and 2 min) x set (1st, 2nd, and 3rd)]. Statistical significance was set at p < 0.05 for all comparisons.
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