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Related Experiment Videos

Periodicity in body temperature in man

J Empson

    Experientia
    |March 15, 1977
    PubMed
    Summary

    Male volunteers showed rhythmic patterns in body temperature and alertness over a 20-day cycle. This study suggests a potential biological rhythm influencing mood and physiological states in men.

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    Area of Science:

    • Chronobiology
    • Human Physiology
    • Psychology

    Background:

    • Understanding human biological rhythms is crucial for health and performance.
    • Previous research indicates circadian rhythms, but longer-term cycles are less understood.

    Purpose of the Study:

    • To investigate potential longer-term biological rhythms in male volunteers.
    • To explore correlations between physiological measures (body temperature) and subjective mood states (alertness).

    Main Methods:

    • Collected daily body temperature and self-assessed alertness data from male volunteers over 7+ weeks.
    • Utilized auto-correlation analysis to identify cyclical patterns in the collected data.

    Main Results:

    • Significant auto-correlation peaks were observed in body temperature data at approximately 20-day intervals.
    • Self-assessed alertness scores also exhibited evidence of rhythmicity, with a period around 22 days.

    Conclusions:

    • Findings suggest the presence of a circa-monthly biological rhythm in men.
    • This rhythm may influence both physiological parameters like body temperature and subjective states such as alertness.

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