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Related Experiment Videos

Cortisol secretion is inhibited during sleep in normal man.

E D Weitzman, J C Zimmerman, C A Czeisler

    The Journal of Clinical Endocrinology and Metabolism
    |February 1, 1983
    PubMed
    Summary

    Sleep inhibits cortisol secretion, even during typical waking hours. This finding reveals how sleep influences biological rhythms, impacting shift work and jet lag adaptation.

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    Area of Science:

    • Endocrinology
    • Sleep Science
    • Chronobiology

    Background:

    • Cortisol secretion follows a circadian rhythm, typically peaking in the morning.
    • The influence of the sleep state itself on cortisol secretion is not fully understood.
    • Understanding sleep's effect on cortisol is crucial for managing circadian rhythm disruptions.

    Purpose of the Study:

    • To investigate the hypothesis that sleep actively inhibits cortisol secretion.
    • To examine the relationship between sleep stages and cortisol levels.
    • To explore the impact of altered sleep timing on cortisol patterns.

    Main Methods:

    • Six healthy young men (18-24 years) underwent a 4-day protocol including baseline sleep, sleep deprivation, and phase-shifted sleep.
    • Plasma cortisol concentrations were measured every 20 minutes via indwelling venous catheter.
    • Rectal temperature and sleep stages (polygraphy) were continuously monitored.

    Main Results:

    • Cortisol secretion was suppressed during the initial 4 hours of sleep, irrespective of the time of day.
    • Cortisol levels were elevated when subjects were awake during their usual sleep times.
    • Body temperature decreased during sleep, while specific sleep stages (REM, Stage 4) showed altered patterns with sleep phase shifts.

    Conclusions:

    • Sleep exerts an inhibitory effect on cortisol secretion, independent of circadian influences.
    • These findings highlight the neurophysiological mechanisms underlying sleep's role in regulating biological rhythms.
    • The results have implications for understanding and managing conditions related to shift work, sleep deprivation, and jet lag.

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