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Twitch potentiation after fatiguing exercise in man.

S E Alway, R L Hughson, H J Green

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1987
    PubMed
    Summary

    Twitch potentiation in the triceps surae muscle was examined after fatiguing exercise. Ischemic exercise significantly reduced twitch torques but increased relative potentiation, suggesting fatigue mechanisms do not impair potentiation extent.

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    Area of Science:

    • Human physiology
    • Muscle physiology
    • Exercise physiology

    Background:

    • Twitch potentiation is a phenomenon where a muscle twitch is enhanced following a previous contraction.
    • Understanding potentiation mechanisms is crucial for interpreting muscle fatigue and performance.

    Purpose of the Study:

    • To investigate the effects of intermittent maximal voluntary contractions and electrical stimulation on twitch potentiation in the human triceps surae complex.
    • To compare the impact of exercise with intact circulation versus circulatory occlusion on twitch characteristics and potentiation.

    Main Methods:

    • Maximal voluntary contractions and 20 Hz electrical stimulation were applied to the triceps surae.
    • Exercise was performed with intact circulation or circulatory occlusion until a 50% decline in force output.

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  • Twitch torque, contraction time, and relaxation time were measured before and after exercise, with relative potentiation calculated.

    • Main Results:

    • Voluntary ischemic exercise most severely reduced unpotentiated and potentiated twitch torques.
    • Relative potentiation (potentiated/unpotentiated twitch) increased significantly after voluntary ischemic exercise.
    • Twitch contraction and relaxation times were altered differently by non-occluded and ischemic exercise, with some parameters recovering quickly post-exercise.

    Conclusions:

    • The mechanisms causing fatigue that reduce voluntary and twitch torques do not interfere with the degree of potentiation after fatiguing exercise.
    • Circulatory occlusion during fatiguing exercise leads to greater reductions in twitch torque but enhances relative potentiation.