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Changes in cortisol secretion during shiftwork: implications for tolerance to shiftwork?

J Hennig1, P Kieferdorf, C Moritz

  • 1Department of Psychology, University of Giessen, Germany.

Ergonomics
|June 5, 1998
PubMed
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Night-shift work alters circadian rhythms, with cortisol levels reversing after five nights. However, some workers show no rhythm change and have poor sleep recovery, potentially linked to neuroticism.

Area of Science:

  • Chronobiology
  • Occupational Health
  • Endocrinology

Background:

  • Circadian rhythms, particularly cortisol secretion, are affected by night-shift work.
  • Previous studies on shift work's impact on biological rhythms are limited by sample size and sampling duration.

Purpose of the Study:

  • To determine the extent and timing of biological rhythm changes during night shifts.
  • To investigate the association between these rhythm changes and tolerance to shift work.

Main Methods:

  • Investigated 24 night-shift workers in a cardiac emergency unit over seven nights.
  • Collected frequent saliva samples for cortisol determination (28 measurements per subject).
  • Analyzed individual and group patterns of cortisol circadian rhythm changes.

Related Experiment Videos

Main Results:

  • A significant reversal of circadian function (mean cortisol) was observed for the group after the fifth night.
  • Six out of 24 subjects (25%) showed no change in their cortisol circadian rhythm.
  • Non-adapters exhibited shorter and less consistent recovery sleep and a pattern associated with neuroticism.

Conclusions:

  • Shift work significantly alters cortisol circadian rhythms in most individuals.
  • A subset of shift workers may not adapt, showing persistent rhythm disruption and potential links to personality traits like neuroticism.
  • Further research with larger sample sizes is needed to confirm findings on non-adapters and neuroticism.