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Related Experiment Videos

Melatonin: marvel or marker?

D F Kripke1, J A Elliot, S D Youngstedt

  • 1Department of Psychiatry and the Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, La Jolla 92093-0667, USA. dkripke@ucsd.edu

Annals of Medicine
|April 29, 1998
PubMed
Summary
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Melatonin

Area of Science:

  • Chronobiology
  • Endocrinology
  • Sleep Medicine

Background:

  • Melatonin's known physiological effects include skin lightening and potential gonadal atrophy.
  • Despite these effects, melatonin is sometimes proposed as an anti-aging therapy.
  • Circadian rhythm disruption is common in aging and sleep disorders.

Purpose of the Study:

  • To investigate the utility of 6-sulphatoxymelatonin (6-SMT) excretion as a marker for circadian rhythm phase disorders.
  • To compare 6-SMT excretion patterns in postmenopausal women and elderly individuals with sleep complaints to healthy young adults.

Main Methods:

  • Measured urinary 6-SMT excretion in 150 postmenopausal women, 72 elderly volunteers (insomnia/depression), and 20 young controls.
  • Calculated the acrophase (peak excretion time) of 6-SMT as a marker of circadian timing.

Related Experiment Videos

  • Correlated 6-SMT acrophase with sleep parameters and complaints.

    • Main Results:

    • No significant relationship was found between total daily 6-SMT excretion and sleep duration or complaints.
    • A significant proportion of postmenopausal women (42%) and elderly volunteers (48%) exhibited 6-SMT acrophases outside the normal range observed in young controls.
    • Deviant 6-SMT acrophases were associated with increased sleep disturbances and complaints.

    Conclusions:

    • Urinary 6-SMT excretion, specifically its acrophase, serves as a valuable indicator of circadian rhythm phase disorders.
    • The findings highlight the need for caution when considering melatonin administration, particularly in aging populations or those with sleep issues.