Date of Award

5-2024

Degree Type

Report

Degree Name

Master of Science (MS)

Department

Kinesiology and Health Science

Committee Chair(s)

Brennan Thompson

Committee

Brennan Thompson

Committee

Dale Wagner

Committee

Jon Carey

Abstract

Post-activation potentiation (PAP) is a phenomenon that can enhance muscle performance following maximal or near-maximal muscle contractions. While the effects of concentric and isometric conditioning contractions on PAP have been studied, less is known about the influence of eccentric muscle actions. This study investigated the effects of a multi-joint eccentric overload (EOL) protocol on PAP expressed through countermovement jump (CMJ) height and isokinetic peak force (PF) outcome measures. Twenty-eight recreationally trained participants (18-30 years) completed three visits in a randomized, counterbalanced design. Following familiarization, participants performed either an EOL protocol involving 2 sets of 6 maximal isokinetic eccentric contractions or a control condition (CON) involving cycling. CMJ and PF were assessed at baseline and 15 seconds, 5 minutes, and 10 minutes post-exercise. Results showed no significant condition × time interaction or main effect of condition for either CMJ or PF (p > 0.05). However, a significant main effect of time (collapsed across condition) was observed for CMJ (p = 0.019), with post hoc analyses revealing significantly higher CMJ at 5 minutes post-exercise compared to 15 seconds post-exercise (p = 0.037). These findings suggest that this multi-joint eccentric protocol did not effectively elicit PAP, and therefore may not be optimal for inducing acute performance enhancement. Future research should further elucidate the optimal eccentric loading parameters and contraction types for inducing PAP.

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