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Muscle damage and endurance events.

R B Armstrong

    Sports Medicine (Auckland, N.Z.)
    |September 1, 1986
    PubMed
    Summary

    Endurance exercise like marathons can cause skeletal muscle fiber injury, evidenced by blood markers and soreness. While training helps, mechanical strain may initiate damage, with regeneration preventing fiber loss.

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    Area of Science:

    • Sports Medicine
    • Exercise Physiology
    • Muscle Biology

    Background:

    • Intensive endurance events, such as marathons, are associated with skeletal muscle fiber injury.
    • Evidence includes elevated intramuscular enzymes and myoglobin in blood, muscle soreness, and histological findings.

    Purpose of the Study:

    • To investigate the nature and potential causes of skeletal muscle fiber injury following endurance exercise.
    • To explore the role of training and other factors in mitigating this injury.

    Main Methods:

    • Analysis of blood markers (enzymes, myoglobin) post-exercise.
    • Subjective reporting of muscle soreness.
    • Histological examination of muscle tissue samples.

    Main Results:

    • Histological studies reveal degenerative changes and necrosis in muscle fibers after exercise.
    • Macrophages and phagocytic cells clear damaged fibers, followed by apparent regeneration.
    • Eccentric contractions appear to cause more damage, suggesting mechanical strain is a key factor.

    Conclusions:

    • Muscle fiber injury is a common response to intense endurance exercise, with regeneration preventing net fiber loss.
    • Mechanical strain, rather than metabolic overload, is hypothesized as a primary initiator of cellular damage.
    • Training mitigates exercise-induced muscle damage, but chronic injury may occur with escalating training intensities; no other preventative measures are proven effective.

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