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Related Experiment Video

Updated: May 8, 2026

Experimental Methods to Study Human Postural Control
08:12

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Fatiguing exercise intensity influences the relationship between parameters reflecting neuromuscular function and

Sébastien Boyas1, Anthony Remaud, Erin Rivers

  • 1Bruyère Research Institute, Aging and Movement Research Laboratory, Ottawa, Ontario, Canada. sebastien.boyas@hotmail.com

Plos One
|August 31, 2013
PubMed
Summary

Exercise intensity impacts fatigue type but not the degree of postural instability. Lower intensity exercise (25%) showed more central fatigue and better prediction of postural changes from neuromuscular function.

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Area of Science:

  • Exercise Physiology
  • Neuromuscular Function
  • Biomechanics

Background:

  • Fatigue induced by exercise can impair neuromuscular function and postural stability.
  • The relationship between exercise intensity, fatigue type (central vs. peripheral), and postural control is not fully understood.

Purpose of the Study:

  • To investigate how different fatiguing exercise intensities affect neuromuscular function and postural stability.
  • To explore the contribution of neuromuscular mechanisms to fatigue-induced postural impairments using multivariate regression.

Main Methods:

  • Eighteen subjects performed single-leg standing balance tests with eyes closed before and after fatiguing isometric plantarflexor contractions at 25%, 50%, and 75% of maximal torque.
  • Neuromuscular function was assessed via maximal torque, electromyography, and twitch interpolation.
  • Multivariate regression analyses examined the relationship between neuromuscular changes and postural stability alterations.

Main Results:

  • The 25% intensity exercise induced primarily central fatigue, while 50% and 75% intensities induced mainly peripheral fatigue.
  • All exercise intensities resulted in similar impairments in postural stability.
  • Neuromuscular function changes explained a larger proportion of postural variability after 25% intensity exercise (R²=0.51–0.82) compared to 50% and 75% (R²=0.17–0.73).

Conclusions:

  • Fatiguing exercise intensity does not alter the extent of postural stability impairment.
  • Exercise intensity influences the type of fatigue (central vs. peripheral) and the specific neuromuscular predictors of postural control changes.
  • Lower intensity fatiguing exercise may provide a more predictable model for studying neuromuscular contributions to postural stability.