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Related Experiment Videos

Plasma melatonin increases during exercise in women

D B Carr, S M Reppert, B Bullen

    The Journal of Clinical Endocrinology and Metabolism
    |July 1, 1981
    PubMed
    Summary

    Vigorous physical activity causes temporary increases in plasma melatonin in women. This effect was observed in both sedentary and endurance-trained individuals during exercise sessions.

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    Area of Science:

    • Endocrinology
    • Exercise Physiology
    • Sports Science

    Background:

    • Melatonin is a hormone crucial for regulating sleep-wake cycles.
    • The relationship between exercise and melatonin levels is not fully understood.
    • Endurance training may influence hormonal responses to physical activity.

    Purpose of the Study:

    • To investigate the effect of acute exercise on plasma melatonin levels.
    • To determine if endurance training alters the acute exercise-induced melatonin response.
    • To examine the temporal changes in melatonin following exercise.

    Main Methods:

    • Plasma melatonin was measured in seven women volunteers.
    • Participants underwent serial acute submaximal exercise tests over two months.

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  • Measurements were taken before, during, and 30 minutes after exercise sessions.

    • Main Results:

    • Plasma melatonin levels significantly increased during all exercise sessions.
    • Melatonin levels returned to baseline approximately 30 minutes post-exercise.
    • These transient increases were observed irrespective of training status.

    Conclusions:

    • Acute, vigorous physical activity transiently elevates plasma melatonin.
    • The exercise-induced melatonin response appears consistent in both sedentary and endurance-trained women.
    • Further research is needed to elucidate the physiological mechanisms behind this response.