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Shift work: coping with the biological clock.

Josephine Arendt1

  • 1Centre for Chronobiology, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK. arendtjo@aol.com

Occupational Medicine (Oxford, England)
|January 7, 2010
PubMed
Summary
This summary is machine-generated.

The body's internal clock struggles to adjust to shift work, causing desynchrony in sleep, metabolism, and hormones. This misalignment increases risks for sleep deprivation, poor performance, and major diseases like heart disease and cancer.

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Area of Science:

  • Chronobiology
  • Occupational Health
  • Physiology

Background:

  • The internal circadian clock adapts slowly to rapid changes in work schedules.
  • Shift work leads to circadian desynchrony, affecting sleep, alertness, performance, and hormone levels (melatonin, cortisol).
  • This desynchrony is linked to sleep deprivation, reduced performance, and increased risks of chronic diseases.

Purpose of the Study:

  • To explain the consequences of circadian desynchrony due to shift work.
  • To explore the link between circadian desynchrony, physiological systems, and disease risk.
  • To discuss strategies for managing circadian desynchrony.

Main Methods:

  • Review of existing literature on circadian rhythms and shift work.
  • Analysis of physiological and hormonal responses to altered work-rest schedules.
  • Examination of epidemiological data on shift work and disease incidence.

Main Results:

  • Circadian clocks do not readily adapt to rapid schedule shifts, causing desynchrony.
  • Desynchrony impacts sleep, performance, metabolism, and hormone regulation.
  • Shift work and circadian desynchrony are associated with increased risks of heart disease and cancer.

Conclusions:

  • Frequent circadian desynchrony from shift work contributes to health risks.
  • Strategies to manage circadian rhythms, particularly light exposure, can help mitigate negative effects.
  • Further research into clock gene variants and disease susceptibility is warranted.