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Exercise, muscle damage and fatigue.

H J Appell1, J M Soares, J A Duarte

  • 1Institute for Experimental Morphology, German Sports University, Cologne, Federal Republic of Germany.

Sports Medicine (Auckland, N.Z.)
|February 1, 1992
PubMed
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Prolonged exercise can cause fatigue and muscle damage through different mechanisms like hypoxia or mechanical stress. A good training status may help reduce these exercise-induced symptoms.

Area of Science:

  • Exercise Physiology
  • Muscle Biology

Background:

  • Prolonged or strenuous exercise, particularly involving eccentric contractions, leads to functional fatigue and structural muscle damage.
  • Mechanisms include hypoxic conditions, free oxygen radical formation, and elevated lysosomal activity for fatigue, and mechanical stress for muscle damage.
  • Despite differing causes, both fatigue and muscle damage result in similar impairments of muscle function.

Purpose of the Study:

  • To differentiate the etiologies of fatigue and muscle damage following exercise.
  • To understand the role of training status in mitigating exercise-induced muscle impairments.
  • To explain the events leading to delayed onset of muscle soreness (DOMS).

Main Methods:

  • Experimental differentiation of fatigue and muscle damage mechanisms.

Related Experiment Videos

  • Observation of functional and structural signs post-exercise.
  • Analysis of events contributing to DOMS.

    • Main Results:

    • Fatigue from prolonged exercise involves hypoxia and free radicals, increasing lysosomal activity.
    • High-intensity eccentric exercise causes mechanical stress to muscle fibers.
    • Both mechanisms lead to comparable impairments in muscle function.
    • Delayed onset of muscle soreness (DOMS) is linked to structural damage of muscle proteins.

    Conclusions:

    • Fatigue and muscle damage arise from distinct pathways but manifest similarly.
    • Training status can attenuate the clinical presentation of fatigue and muscle damage.
    • DOMS is a consequence of a cascade initiated by structural muscle protein damage.