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Heavy-resistance exercise-induced increases in jump performance are not explained by changes in neuromuscular

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Summary

Heavy-resistance exercise enhanced explosive performance, but did not increase post-activation potentiation (PAP). Neuromuscular function measures, including voluntary activation and twitch potentiation, did not change, contradicting the PAP hypothesis for performance enhancement.

Keywords:
Athletic performanceintracortical facili-tationneuromuscular physiologypost-activation potentiationshort-interval intracortical inhibitiontranscranial magnetic stimulationvoluntary activa-tion

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Area of Science:

  • Neurology
  • Sports Science
  • Exercise Physiology

Background:

  • Post-activation potentiation (PAP) is theorized to enhance explosive muscular performance after intense exercise.
  • Evidence linking PAP to improvements in whole-body explosive performance (PE) following heavy-resistance exercise is inconsistent.
  • Neuromuscular adaptations are proposed mechanisms for PAP, but require further investigation.

Purpose of the Study:

  • To investigate the neuromuscular basis of explosive performance enhancement (PE) after heavy-resistance exercise.
  • To determine if post-activation potentiation (PAP) underlies improvements in PE.
  • To assess changes in corticospinal excitability and muscle activation post-exercise.

Main Methods:

  • Eleven male athletes underwent heavy-resistance exercise.
  • Measures included countermovement jump (CMJ) performance, transcranial magnetic stimulation (TMS) for corticospinal excitability, and femoral nerve stimulation for voluntary activation (VA) and potentiated twitch (Qtw,pot).
  • Neuromuscular assessments were conducted pre- and post-exercise.

Main Results:

  • A significant increase in CMJ performance (+4%) was observed post-exercise, confirming PE.
  • No significant changes were found in maximum voluntary force, VA, corticospinal excitability, short-interval intracortical inhibition (SICI), or intracortical facilitation (ICF).
  • Potentiated twitch (Qtw,pot) significantly declined post-exercise (P < 0.001).

Conclusions:

  • Enhanced explosive performance after heavy-resistance exercise was not associated with post-activation potentiation (PAP).
  • The study found no evidence of altered neuromuscular function contributing to PE in this context.
  • These findings challenge the prevailing hypothesis that PAP is the primary driver of performance enhancement after resistance training.