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Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

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 response...
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Related Experiment Video

Updated: Jun 19, 2026

Induction and Assessment of Exertional Skeletal Muscle Damage in Humans
08:33

Induction and Assessment of Exertional Skeletal Muscle Damage in Humans

Published on: December 11, 2016

Impaired action potential conduction at high force levels after eccentric exercise.

Harri Piitulainen1, Reijo Bottas, Paavo Komi

  • 1Department of Biology of Physical Activity, Neuromuscular Research Center, University of Jyväskylä, Finland. harri.piitulainen@sport.jyu.fi

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|November 3, 2009
PubMed
Summary

Intensive eccentric exercise temporarily impairs biceps muscle sarcolemmal function. This impairment, affecting muscle fibre conduction velocity and mean power frequency, predominantly impacts higher-threshold motor units.

Related Experiment Videos

Last Updated: Jun 19, 2026

Induction and Assessment of Exertional Skeletal Muscle Damage in Humans
08:33

Induction and Assessment of Exertional Skeletal Muscle Damage in Humans

Published on: December 11, 2016

Area of Science:

  • Exercise Physiology
  • Muscle Physiology
  • Neuromuscular Function

Background:

  • Eccentric exercise, characterized by muscle lengthening under load, can induce significant muscle damage and functional deficits.
  • Understanding the impact of such exercise on sarcolemmal integrity is crucial for recovery and training protocols.

Purpose of the Study:

  • To investigate the functional integrity of the sarcolemma in the biceps brachii muscle following intensive eccentric elbow flexor exercise.
  • To assess changes in muscle fibre conduction velocity (CV) and mean power frequency (MNF) at various contraction intensities post-exercise.

Main Methods:

  • High-density surface electromyography (sEMG) was employed to record electrical activity from the biceps brachii.
  • Measurements included root mean square (RMS), MNF, and CV during maximal voluntary contractions (MVC) and electrically evoked M-waves.
  • Data were collected pre-exercise and up to four days post-exercise.

Main Results:

  • Maximal voluntary contraction force decreased significantly up to two days post-exercise.
  • Both CV and MNF were reduced during MVC and evoked M-waves two hours post-exercise.
  • At submaximal forces, CV and MNF reductions were observed only at higher contraction levels (40-75% MVC).

Conclusions:

  • Intensive eccentric exercise leads to temporary impairment of gross sarcolemmal function.
  • The observed deficits, particularly in CV and MNF, suggest a predominant impact on higher-threshold motor units, aligning with Henneman's size principle.