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Forearm composition and muscle function in trained and untrained limbs.

R J Maughan, R W Abel, J S Watson

    Clinical Physiology (Oxford, England)
    |August 1, 1986
    PubMed
    Summary

    Years of training significantly alter forearm composition. Tennis players show increased muscle proportion and decreased fat in their dominant arms compared to their non-dominant arms, demonstrating exercise-induced adaptations.

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    Area of Science:

    • Sports Medicine
    • Human Physiology
    • Biomechanics

    Background:

    • Long-term physical training induces anatomical and physiological adaptations.
    • Understanding limb-specific changes in response to training is crucial for sports science.
    • Forearm composition (muscle, fat, bone) can be influenced by repetitive, unilateral activities.

    Purpose of the Study:

    • To investigate the long-term effects of training on human forearm composition.
    • To compare the muscle, fat, and bone proportions between trained and untrained limbs.
    • To assess the relationship between forearm composition and isomeric strength in athletes.

    Main Methods:

    • Computed tomography (CT) scans were used to quantify fat, muscle, and bone volumes in the forearms of trained tennis players and a control group.

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  • Measurements were taken at intervals along the forearm to determine regional composition.
  • Isometric force and grip strength were measured to correlate with muscle volume.

    • Main Results:

    • The dominant forearm in trained subjects showed significantly greater total volume and muscle volume compared to the non-dominant arm.
    • Trained limbs exhibited a higher proportion of muscle and a lower proportion of fat than contralateral limbs.
    • While dominant limbs produced greater isometric force, the strength-to-muscle-volume ratio remained consistent across limbs and groups.

    Conclusions:

    • Prolonged, unilateral training leads to significant muscle hypertrophy and fat reduction in the trained forearm.
    • These compositional changes contribute to enhanced force production in the dominant limb.
    • The study highlights the adaptive capacity of musculoskeletal tissues to specific training regimens.