Date of Award


Degree Type


Degree Name

Master of Science (MS)


Kinesiology and Health Science

Committee Chair(s)

Brennan Thompson


Brennan Thompson


Dale Wagner


Jon Carey


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.