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In vivo Measurement of Knee Extensor Muscle Function in Mice
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Prolonged depression of knee-extensor torque complexity following eccentric exercise.

Jamie Pethick1, Katherine Whiteaway1, Samantha L Winter1

  • 1Endurance Research Group, School of Sport and Exercise Sciences, University of Kent, UK.

Experimental Physiology
|November 29, 2018
PubMed
Summary
This summary is machine-generated.

Eccentric exercise prolonged knee-extensor torque complexity loss for 24 hours, unlike acute muscle fatigue which recovered in 10 minutes. This finding highlights the lasting impact of muscle-damaging eccentric exercise on neuromuscular control.

Keywords:
complexityeccentricfatiguefractal scalingnon-linear dynamics

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Area of Science:

  • Exercise Physiology
  • Neuromuscular Function
  • Muscle Damage and Fatigue

Background:

  • Neuromuscular fatigue diminishes the temporal structure (complexity) of muscle torque output.
  • Exercise-induced muscle damage leads to longer-lasting reductions in muscle torque output compared to high-intensity fatiguing contractions.

Purpose of the Study:

  • To investigate if muscle-damaging eccentric exercise causes a persistent decrease in knee-extensor torque complexity.
  • To compare the recovery time of torque complexity after eccentric exercise versus fatiguing isometric exercise.

Main Methods:

  • Ten healthy participants underwent isometric contractions at 50% maximal voluntary contraction (MVC) before and after eccentric and isometric exercise protocols.
  • Torque and surface EMG signals were analyzed for complexity using approximate entropy (ApEn) and detrended fluctuation analysis (DFA α).
  • Maximal voluntary contractions (MVCs) with femoral nerve stimulation were used to assess global, central, and peripheral neuromuscular perturbations.

Main Results:

  • Both eccentric and isometric exercise reduced torque complexity (ApEn).
  • Torque complexity recovery took 24 hours after eccentric exercise but only 10 minutes after isometric exercise.
  • Maximal voluntary contraction torque remained reduced for 48 hours post-eccentric exercise, contrasting with the 60-minute recovery after isometric exercise.

Conclusions:

  • Eccentric exercise causes a prolonged depression in knee-extensor torque complexity.
  • The duration of torque complexity loss after eccentric exercise is significantly longer than that observed after acute muscle fatigue.
  • Prolonged reductions in maximal muscle torque output following eccentric exercise are associated with sustained decreases in torque complexity.