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Updated: Jun 18, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
[Morbidity of irregular work schedules].
1Laboratoire du Sommeil, C.H.U. de Charleroi, Site André Vésale. Montigny-le-Tilleul. s.noel@skynet.be
Shift work disrupts circadian rhythms, negatively impacting physical and mental health. This review highlights links between irregular schedules and various health issues, affecting millions of workers globally.
Area of Science:
- Occupational Health
- Chronobiology
- Epidemiology
Background:
- Shift work affects 20% of the European workforce, with many experiencing adverse health effects.
- Older workers face greater challenges adapting to irregular work schedules.
- Disruption of circadian rhythms is a primary mechanism linking shift work to health problems.
Purpose of the Study:
- To review existing literature on the health consequences of shift work.
- To identify the range of physical and mental health issues associated with irregular work schedules.
- To underscore the impact of circadian rhythm disruption.
Main Methods:
- Literature review of epidemiologic studies.
- Analysis of population-based data on shift work and health outcomes.
- Synthesis of findings on physiological effects.
Main Results:
- Shift work is associated with sleep disorders, cancer, cardiovascular disease, diabetes, and obesity.
- Negative impacts extend to reproductive health (reduced fecundity, preterm births) and accident rates.
- Age exacerbates difficulties in adjusting to shift work and increases health risks.
Conclusions:
- Shift work poses significant risks to physical health, mental well-being, and overall safety.
- Circadian rhythm disruption is a key factor mediating these adverse effects.
- Further research and interventions are needed to mitigate the health burden of shift work.
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