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Dose-Response Effect of an Inertia Flywheel Postactivation Performance Enhancement Protocol on Countermovement Jump

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This study found that high-load inertial flywheel squats did not improve countermovement jump performance, suggesting the protocol may induce too much fatigue for postactivation performance enhancement (PAPE).

Keywords:
eccentricnear-maximalpostactivation potentiation

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Postactivation performance enhancement (PAPE) is a phenomenon where a prior bout of exercise can enhance subsequent explosive performance.
  • Inertial flywheel (IFw) training offers a unique resistance profile that may influence PAPE effects.
  • Understanding the dose-response relationship of IFw protocols is crucial for optimizing PAPE.

Purpose of the Study:

  • To investigate the dose-response relationship of a high-load, 6-repetition maximum inertial flywheel (IFw) squat PAPE protocol on countermovement jump (CMJ) performance.
  • To determine the effects of varying set volumes (1, 2, or 3 sets) of IFw squats on CMJ metrics.

Main Methods:

  • Thirteen subjects underwent sessions to establish 6-repetition maximums for back squats and IFw loads.
  • Subjects performed 1, 2, or 3 sets of IFw squats at their 6-repetition maximum load.
  • Countermovement jumps were assessed at multiple time points (1, 3, 6, 9, 12 minutes) post-IFw exercise using force plate analysis.

Main Results:

  • No significant main time or volume effects were observed for jump height, contact time, reactive strength index, peak force, or impulse variables.
  • A significant main time effect was found for flight time (P = .006) and peak power (P = .001).
  • Despite time effects in some variables, overall CMJ performance, particularly jump height, did not improve.

Conclusions:

  • A high-load, 6-repetition maximum IFw squat protocol may not effectively induce PAPE for CMJ performance.
  • The lack of improvement in CMJ performance could be attributed to excessive fatigue induced by the IFw protocol.
  • Further research is needed to explore optimal IFw loading parameters and set volumes for eliciting PAPE.