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Exercise-induced muscle damage and adaptation.

C B Ebbeling1, P M Clarkson

  • 1Department of Exercise Science, University of Massachusetts, Amherst.

Sports Medicine (Auckland, N.Z.)
|April 1, 1989
PubMed
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Unaccustomed exercise causes muscle damage, but repeated exercise bouts reduce this damage. This "rapid training effect" may involve eliminating susceptible muscle fibers or adaptations in connective tissue, enhancing resistance to injury.

Area of Science:

  • Exercise physiology
  • Skeletal muscle biology
  • Sports medicine

Background:

  • Unaccustomed exercise can cause temporary, repairable skeletal muscle damage.
  • Eccentric exercise and exhaustive endurance exercise induce muscle damage through mechanical forces and metabolic disturbances.
  • Plasma creatine kinase (CK) is a common marker for muscle damage, but its interpretation is complicated by unexplained efflux/clearance and intersubject variability.

Purpose of the Study:

  • To explore the mechanisms underlying exercise-induced muscle damage and repair.
  • To investigate the factors influencing muscle damage and repair processes.
  • To examine the 'repeated bout effect' or 'rapid training effect' where subsequent exercise bouts cause less damage.

Main Methods:

  • Analysis of muscle biopsies following eccentric exercise to observe structural changes (e.g., Z-disc disruption).

Related Experiment Videos

  • Monitoring plasma creatine kinase (CK) levels as a marker of muscle damage.
  • Review of existing literature on exercise-induced muscle damage, repair mechanisms, and training adaptations.

    • Main Results:

    • Eccentric exercise causes muscle soreness, loss of force, and elevated plasma CK.
    • Damage progresses post-exercise, with repair occurring over time.
    • A single prior exercise bout significantly reduces damage markers (morphological alterations, performance decrements, plasma CK) in a subsequent bout 1-6 weeks later.

    Conclusions:

    • The 'repeated bout effect' suggests adaptations occur after initial exercise, reducing subsequent muscle damage.
    • Hypotheses for this effect include elimination of stress-susceptible fibers or regeneration of damaged areas.
    • Adaptations in regenerated muscle fibers and connective tissue likely contribute to increased resistance against exercise-induced muscle damage.