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[Biologic rhythms: their changes in night-shift workers].

L Weibel1, M Follénius, G Brandenberger

  • 1Laboratoire des Régulations Physiologiques et des Rythmes Biologiques chez l'Homme, Institut de Physiologie, Faculté de Médecine, Strasbourg.

Presse Medicale (Paris, France : 1983)
|March 17, 1999
PubMed
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Night shift work partially disrupts biological rhythms, including melatonin, cortisol, and TSH. This partial adaptation in circadian rhythms may explain health and sleep issues in night workers.

Area of Science:

  • Chronobiology
  • Endocrinology
  • Human Physiology

Context:

  • Environmental cycles, like light-dark, synchronize biological systems via the hypothalamus.
  • Night shift work (affecting 20% of France's workforce) desynchronizes sleep-wake cycles from environmental cues.
  • Conflicting cues challenge biological rhythms, impacting the brain's internal clock.

Purpose:

  • To investigate the impact of night shift work on biological rhythms.
  • To analyze hormonal patterns (melatonin, cortisol, TSH, PRL, GH) in night shift workers.
  • To determine the extent of biological rhythm adaptation in individuals working at night.

Summary:

  • Night shift work leads to partial adaptation of biological rhythms, with significant individual variability.

Related Experiment Videos

  • Melatonin patterns show variable shifts, while cortisol and TSH rhythms are distorted.
  • Growth hormone (GH) and prolactin (PRL) patterns exhibit incomplete adaptation, influenced by both sleep and circadian components.

    • Impact:

    • Perturbed endocrine functions due to night work and daytime sleep can lead to health and sleep disorders.
    • Findings highlight the need for further research into resynchronization strategies for the biological clock.
    • Understanding these disruptions is crucial for mitigating long-term health consequences in shift workers.