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Growth hormone secretion in night workers

L Weibel1, M Follenius, K Spiegel

  • 1Laboratoire de Physiologie et de Psychologie Environnementales CNRS, Strasbourg, France.

Chronobiology International
|January 1, 1997
PubMed
Summary

Growth hormone (GH) secretion is primarily sleep-dependent, but circadian rhythms also play a role. Night workers show incomplete adaptation of their GH rhythm to altered sleep schedules, indicating a persistent circadian influence.

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Area of Science:

  • Endocrinology
  • Chronobiology
  • Sleep Medicine

Background:

  • Cortisol and TSH rhythms show partial adaptation in night workers.
  • Growth hormone (GH) rhythm is considered mainly sleep-dependent with a potential weak circadian drive.

Purpose of the Study:

  • To investigate the adaptation of the GH rhythm in night workers.
  • To assess the influence of sleep and circadian factors on GH secretion patterns.

Main Methods:

  • Studied 11 night workers and 2 control groups of day-active subjects.
  • Calculated GH secretory rates using deconvolution of plasma concentrations.
  • Analyzed GH secretion during usual and shifted sleep-wake cycles.

Main Results:

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  • Total 24-h GH secretion did not differ between groups.
  • Main GH secretory episode occurred during the first half of sleep.
  • Night workers exhibited incomplete adjustment of GH rhythm to nocturnal schedules.

    • Conclusions:

    • Sleep significantly influences the GH rhythm.
    • A circadian influence on GH rhythm is evident, especially after acute sleep shifts.
    • GH rhythm adjustment is incomplete in individuals with night work schedules.