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Sex differences in static muscular endurance.

H Sato, J Ohashi

    Journal of Human Ergology
    |June 1, 1989
    PubMed
    Summary

    Men exhibit greater maximal voluntary contraction (MVC) strength than women. Muscular fatigue occurs faster in men at higher absolute forces but slower in women relative to their MVC, especially at lower contraction levels.

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    Area of Science:

    • Human physiology
    • Exercise science
    • Musculoskeletal research

    Background:

    • Understanding sex-based differences in muscle fatigue is crucial for exercise prescription and injury prevention.
    • Previous research indicates variations in muscle strength and endurance between men and women.

    Purpose of the Study:

    • To investigate the relationship between isometric contraction force and muscular fatigue onset in male and female elbow flexors.
    • To compare fatigue development based on relative (percentage of maximal voluntary contraction) and absolute force levels.

    Main Methods:

    • Six young men and six young women performed sustained isometric contractions of the elbow flexors at various percentages of their maximal voluntary contraction (MVC).
    • Measures included maximal voluntary contraction (MVC) strength, endurance time, and time to pain appearance.
    • Data were analyzed using logarithmic regression (log T = a + b.log (F--k)) to model force-endurance relationships.

    Main Results:

    • Men demonstrated significantly greater MVC strength than women.
    • When analyzed by relative force (% MVC), women exhibited longer endurance and pain-free times, particularly at lower contraction levels.
    • When analyzed by absolute force (N), men showed longer endurance and pain-free times, especially at higher contraction levels. Some overlap in fatigability was observed at lower absolute forces (<70 N).

    Conclusions:

    • Sex-based differences in muscle fatigability are dependent on whether force is normalized to maximal voluntary contraction (MVC) or considered in absolute terms.
    • Women may have a relative muscular advantage at lower relative force outputs, while men demonstrate greater absolute force endurance.
    • These findings highlight the importance of considering both relative and absolute force when evaluating muscle fatigue and performance differences between sexes.

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