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In vivo Measurement of Knee Extensor Muscle Function in Mice
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Postactivation potentiation during voluntary contractions after continued knee extensor task-specific practice.

Laurent B Seitz1, Gabriel S Trajano, Fabien Dal Maso

  • 1Centre for Exercise and Sports Sciences Research (CESSR), School of Exercise and Health Sciences, Edith Cowan University, Joondalup, WA 6027, Australia.

Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquee, Nutrition Et Metabolisme
|February 11, 2015
PubMed
Summary
This summary is machine-generated.

Dynamic conditioning activities (CAs) can enhance muscle torque through postactivation potentiation (PAP) even after maximal effort. Longer contraction duration and sufficient work are key factors for this performance boost.

Keywords:
conditioning activityelectrical stimulationextension du genouknee extensionmoment de forcestimulation électriquestimulus conditionnanttorquevelocityvitesse

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biomechanics

Background:

  • Postactivation potentiation (PAP) is a phenomenon where a brief period of intense conditioning activity (CA) enhances subsequent muscle force production.
  • Understanding the specific characteristics of CAs that elicit PAP is crucial for optimizing training protocols.

Purpose of the Study:

  • To determine if dynamic conditioning activities (CAs) induce postactivation potentiation (PAP).
  • To investigate the influence of CA velocity, contraction duration, and total work on PAP.
  • To explore potential peripheral and central mechanisms underlying PAP.

Main Methods:

  • Participants performed 5 different dynamic CAs before maximal voluntary knee extensions.
  • Voluntary and electrically evoked torques, along with electromyogram (EMG) data, were recorded.
  • Measurements were taken at baseline and at intervals up to 13 minutes post-CA.

Main Results:

  • CAs with longer total contraction duration (6 s) and substantial total work (∼750-900 J) significantly increased voluntary and twitch torques for up to 7 and 4 minutes, respectively.
  • These improvements in torque (PAP) occurred regardless of the conditioning activity's velocity.
  • No significant changes in EMG:M-wave were observed, suggesting peripheral, not central, mechanisms were involved.

Conclusions:

  • Dynamic CAs can enhance muscle torque via PAP, even after achieving maximal voluntary contractile capacity.
  • Sufficient CA contraction duration and total work are critical for eliciting PAP.
  • Peripheral adaptations, rather than central neural drive, likely mediate the observed PAP effects.