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Related Concept Videos

Muscle Recovery and Fatigue01:24

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Related Experiment Video

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Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
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Interactions between perceptions of fatigue, effort, and affect decrease knee extensor endurance performance

A Greenhouse-Tucknott1, J G Wrightson1,2, M Raynsford1

  • 1Fatigue and Exercise Laboratory, University of Brighton, Brighton, UK.

Psychophysiology
|June 25, 2020
PubMed
Summary
This summary is machine-generated.

Prior upper body exercise impacts lower limb endurance by altering perceptions of effort and mood, not neuromuscular function. Cognitive-emotional factors, not just physical fatigue, regulate performance in non-exercised muscles.

Keywords:
TMSaffectexercise tolerancefatigueperception of effortvoluntary activation

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Neuroscience

Background:

  • Prior exercise in one muscle group can impair endurance in non-activated muscles.
  • Mechanisms may involve neuromuscular changes or altered perceptual/affective responses.

Purpose of the Study:

  • To investigate how prior handgrip exercise affects knee extensor endurance performance.
  • To examine the roles of behavioral, perceptual, affective, and neuromuscular responses.

Main Methods:

  • Experiment 1: Assessed behavioral, perceptual, and affective responses to knee extensor exercise after handgrip exercise.
  • Experiment 2: Used transcranial magnetic stimulation to evaluate knee extensor neuromuscular function before and after handgrip exercise.

Main Results:

  • Prior handgrip exercise increased perceived effort and reduced affective valence during knee extensor exercise.
  • Perceived effort and affect correlated with endurance performance.
  • Neuromuscular function of knee extensors was not significantly altered by prior handgrip exercise.
  • Subjective fatigue increased but was not directly linked to performance, though it correlated with effort and affect.

Conclusions:

  • Lower limb performance after upper body exercise is regulated by cognitive-emotional interactions, independent of neuromuscular changes.
  • Subjective fatigue influences perceptual and affective processes governing endurance performance.