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Related Experiment Videos

Fatigue and shift work.

Jianhua Shen1, Leigh C P Botly, Sharon A Chung

  • 1Department of Psychiatry, University Health Network, University of Toronto, Toronto, ON, Canada. jianhua.shen@utoronto.ca

Journal of Sleep Research
|February 24, 2006
PubMed
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Shift work significantly increases subjective fatigue but not sleepiness in workers. The Fatigue Severity Scale (FSS) may indicate health risks associated with frequent shift schedules.

Area of Science:

  • Occupational Health
  • Sleep Medicine
  • Psychology

Background:

  • Shift work is common and linked to adverse health outcomes.
  • Distinguishing fatigue and sleepiness is crucial in sleep research.
  • Previous studies show fatigue and sleepiness are distinct phenomena.

Purpose of the Study:

  • To investigate if shift work differentially impacts fatigue and sleepiness.
  • To assess the relationship between shift work frequency and subjective fatigue/sleepiness.

Main Methods:

  • 489 workers completed subjective questionnaires (Fatigue Severity Scale, Epworth Sleepiness Scale).
  • Participants were grouped by shift work frequency (never, <4/month, 1-2/week, ≥3/week).

Main Results:

Related Experiment Videos

  • Shift work frequency significantly affected subjective fatigue (p<0.001).
  • Workers with ≥3 days/week shift work reported significantly higher Fatigue Severity Scale scores.
  • No significant effect of shift work frequency on subjective sleepiness was found.
  • Low correlation between fatigue and sleepiness scores confirmed their independence.

Conclusions:

  • Frequent shift work is associated with increased subjective fatigue.
  • Subjective sleepiness is not significantly affected by shift work frequency.
  • The Fatigue Severity Scale may serve as an indicator for adverse effects of high-frequency shift work.