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Related Experiment Videos

Effect of exercise on the motor unit.

L Edström, L Grimby

    Muscle & Nerve
    |February 1, 1986
    PubMed
    Summary

    Exercise training alters motor unit recruitment and firing rates. Muscle fibers adapt to prolonged exercise, with potential transformations between slow-twitch and fast-twitch types discussed, alongside metabolic and strength adaptations.

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    Area of Science:

    • Exercise Physiology
    • Muscle Biology
    • Neuroscience

    Background:

    • Physically inactive individuals experience changes in motor unit activity with training.
    • Muscle fibers adapt to prolonged exercise, enhancing performance.
    • Motor unit types and muscle fiber characteristics are central to exercise adaptation.

    Purpose of the Study:

    • To review changes in motor unit recruitment and firing rates with training.
    • To discuss muscle fiber type transformation and metabolic adaptations.
    • To examine strength gains and their relation to muscle cross-section.

    Main Methods:

    • Review of existing literature on exercise training effects.
    • Analysis of studies on voluntary and stimulated muscle activity.
    • Examination of metabolic and morphological adaptations in muscle fibers.

    Main Results:

    • Exercise training modifies motor unit recruitment and firing rates.
    • Muscle fibers adapt to increased usage, showing potential for type transformation.
    • Endurance training induces metabolic adaptations; strength training increases muscle cross-section.

    Conclusions:

    • Muscle fiber transformation is an adaptive response to increased neuronal or electrical activity.
    • Metabolic adaptations enhance endurance capacity.
    • The basis of strength increase (fiber hypertrophy vs. hyperplasia) remains debated.

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