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Contraction intensity and sex differences in knee-extensor fatigability.

Paul Ansdell1, Kevin Thomas1, Glyn Howatson2

  • 1Faculty of Health and Life Sciences, Department of Sport, Exercise, and Rehabilitation, Northumbria University, Newcastle, UK.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|October 1, 2017
PubMed
Summary

Females exhibit less fatigability than males in knee-extension exercises. This sex difference in muscle fatigue is evident during intermittent isometric contractions and is independent of overall strength.

Keywords:
ElectromyographyForce fluctuationsMuscle fatigueQuadricepsSex differences

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Area of Science:

  • Exercise Physiology
  • Human Performance
  • Muscle Physiology

Background:

  • Sex differences in muscle fatigability are well-documented for various contraction types.
  • However, specific research on knee-extensor fatigability between sexes is limited.

Purpose of the Study:

  • To investigate sex-based differences in performance fatigability.
  • Focus on intermittent, isometric contractions of the knee-extensor muscles.

Main Methods:

  • Eighteen participants (10 males, 8 females) underwent fatiguing protocols.
  • Knee-extensor contractions performed at 30% MVC for 30 min and 50% MVC until task failure.
  • Maximal Voluntary Contraction (MVC) and electromyography (EMG) measured periodically.

Main Results:

  • Males showed greater reduction in MVC force at both 30% and 50% MVC compared to females.
  • Females sustained the 50% MVC task significantly longer than males.
  • Males exhibited faster increases in EMG activity and force fluctuations.

Conclusions:

  • Females are less fatigable than males during intermittent isometric knee-extension contractions.
  • This sex-based difference in fatigability persists regardless of muscular strength.
  • Findings highlight important sex-specific considerations in exercise and rehabilitation.