Pincivero, D. M., Gear, W. S., Moyna, N. M., & Robertson, R. J. (1999). The effects of rest interval on quadriceps torque and perceived exertion in healthy males. Journal of Sports medicine and Physical Fitness, 39, 294-299.

This study examined the effects of rest interval on quadriceps torque and RPE during multiple sets of resisted knee extensions. Males (N = 14) were assigned to one of two groups: short-rest interval (40 s) and long-rest interval (160 s). Ss performed 4 x 20 maximal isokinetic contractions with their assigned inter-set rest interval. After each set, an RPE was obtained.

Declines in peak torque, total work, and average power were significantly greater for the short-rest than the long-rest groups. RPE was similar for both groups.

Implication. RPE does not reflect performance declines due to strength-training fatigue. Individuals perceived working to particular effort levels, irrespective of the state of fatigue.

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