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Related Experiment Videos

Neuroendocrine rhythms and sleep in aging men.

A van Coevorden1, J Mockel, E Laurent

  • 1School of Medicine, Université Libre de Bruxelles, Belgium.

The American Journal of Physiology
|April 1, 1991
PubMed
Summary

Aging alters neuroendocrine rhythms, reducing hormone secretion amplitude and advancing circadian timing. Elderly men showed diminished thyroid-stimulating hormone (TSH), growth hormone (GH), prolactin, and melatonin, impacting sleep patterns.

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Area of Science:

  • Endocrinology
  • Gerontology
  • Chronobiology

Background:

  • Aging significantly impacts physiological functions, including neuroendocrine secretions.
  • Understanding age-related changes in hormone secretion patterns is crucial for health management in the elderly.

Purpose of the Study:

  • To investigate the effects of aging on basal levels and temporal patterns of key neuroendocrine secretions.
  • To compare 24-hour hormone profiles between healthy elderly men and young adults.

Main Methods:

  • Simultaneous 24-hour monitoring of cortisol, TSH, melatonin, prolactin, and GH levels.
  • Polygraphic sleep recording and laboratory habituation in eight elderly (67-84 yr) and eight young (20-27 yr) healthy men.

Main Results:

Related Experiment Videos

  • Elderly men exhibited reduced circadian amplitude for cortisol and diminished daytime/nighttime TSH and GH.
  • Prolactin and melatonin decreased during nighttime only; circadian rises of cortisol, TSH, and melatonin occurred earlier.
  • Age-related hormonal decreases correlated with reduced pulse amplitude, not frequency, despite sleep perturbations.

Conclusions:

  • Normal aging alters central mechanisms controlling endocrine temporal organization and reduces secretory outputs.
  • Circadian timekeeping is modified during senescence, affecting hormone release and sleep architecture.
  • Sleep-related hormone release persists in elderly men despite altered patterns.