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Related Experiment Videos

Rapid adaptation to eccentric exercise-induced muscle damage

J Mair1, M Mayr, E Müller

  • 1Department of Medical Chemistry and Biochemistry, University of Innsbruck, Austria.

International Journal of Sports Medicine
|August 1, 1995
PubMed
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Eccentric exercise causes muscle damage, indicated by increased creatine kinase (CK) and myosin heavy chains (MHC). Repeated exercise leads to adaptation, reducing muscle soreness and biomarkers.

Area of Science:

  • Exercise Physiology
  • Muscle Biology
  • Sports Medicine

Background:

  • Eccentric exercise is known to induce muscle damage.
  • Understanding the markers and adaptation patterns is crucial for training protocols.

Purpose of the Study:

  • To investigate muscle damage and adaptation following eccentric exercise.
  • To analyze the effects of repeated eccentric exercise bouts at different intervals.

Main Methods:

  • Twenty-two male subjects performed eccentric knee extensor exercise.
  • Muscle soreness, force generation (vertical jump), and plasma biomarkers (CK, MHC) were measured.
  • Exercise was repeated after 4 days (Group A) and 13 days (Group B).

Main Results:

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  • Initial exercise increased CK and MHC, decreased muscle force, and caused soreness.
  • CK and MHC release correlated, but not with force reduction.
  • Repeated exercise after 13 days showed no significant damage markers or soreness.
  • Repeated exercise after 4 days abolished significant CK and MHC increases, with less soreness.

Conclusions:

  • Eccentric exercise causes slow-twitch skeletal muscle fiber injury.
  • Rapid adaptation occurs, significantly reducing muscle damage and soreness upon subsequent exercise bouts.
  • The timing of repeated exercise influences the adaptive response.