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Circadian rhythms in endogenous depression.

D von Zerssen, H Barthelmes, G Dirlich

    Psychiatry Research
    |September 1, 1985
    PubMed
    Summary
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    This study found that circadian rhythms are altered in endogenous depression, with reduced daily variations in mood and body temperature. Mood worsening during depression is linked to cortisol secretion patterns.

    Area of Science:

    • Chronobiology
    • Psychiatry
    • Neuroendocrinology

    Background:

    • Circadian rhythm disruptions are implicated in various mood disorders.
    • Endogenous depression is characterized by significant mood and physiological changes.
    • Understanding these rhythms may offer novel therapeutic targets.

    Purpose of the Study:

    • To investigate circadian rhythm alterations in patients with endogenous depression.
    • To compare these rhythms with those in healthy controls and patients in remission.
    • To explore the relationship between mood, cortisol, and circadian patterns.

    Main Methods:

    • A study involving 16 drug-free patients with endogenous depression and 10 healthy controls.
    • Monitoring of body temperature, urinary potassium, urinary free cortisol, and motor activity.

    Related Experiment Videos

  • Assessment of self-rated mood and its correlation with physiological variables.

    • Main Results:

    • No free-running periods were observed in any measured variable.
    • Reduced circadian variation in motor activity, body temperature, and urinary potassium during depression.
    • Circadian mood worsening occurred later during depression, correlating with urinary free cortisol acrophase.

    Conclusions:

    • Depression is associated with dampened circadian rhythms, not phase shifts.
    • The circadian pattern of depression may be entrained to cortisol secretion rhythms.
    • Masking effects of depressive symptoms likely influence observed circadian phenomena.