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Changes in isometric function following rhythmic exercise.

M D Hoffman, C A Williams, A R Lind

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1985
    PubMed
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    Dynamic exercise impacts isometric muscle function. Increased cycling intensity and duration beyond certain thresholds reduce isometric endurance and strength, suggesting distinct control mechanisms for each. Muscle temperature plays a role in these performance changes.

    Area of Science:

    • Exercise Physiology
    • Muscle Physiology
    • Sports Science

    Background:

    • Dynamic exercise precedes isometric contractions.
    • Muscle temperature changes during exercise.
    • Cardiovascular responses vary with exercise intensity.

    Purpose of the Study:

    • To investigate the influence of dynamic exercise intensity and duration on subsequent isometric muscle function.
    • To examine the role of muscle temperature in exercise-induced changes in isometric performance.
    • To differentiate the control mechanisms affecting isometric endurance and strength.

    Main Methods:

    • Male subjects performed cycling exercise at varying intensities (20-80% VO2max) and durations (1-20 min).
    • Subjects then performed sustained quadriceps contractions to fatigue at 40% maximal voluntary contraction.

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  • Muscle temperature was measured before and after cycling; heart rate and blood pressure were monitored during isometric contractions.

    • Main Results:

    • Isometric endurance decreased with cycling intensity above 20% VO2max and duration up to 10 min.
    • Linear relationships existed between muscle temperature and isometric endurance at 60% and 80% VO2max.
    • Quadriceps strength showed an inverse relationship with muscle temperature, significantly reduced only after 80% VO2max cycling.

    Conclusions:

    • Different mechanisms likely control exercise-induced reductions in isometric endurance and strength.
    • Muscle temperature is a significant factor influencing isometric performance post-dynamic exercise.
    • Heart rate and blood pressure responses during isometric contractions are differentially regulated and influenced by prior dynamic exercise.