Related Experiment Video
Updated: Apr 20, 2026
08:36
Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
13.0K
Exploring chronotype, sleep patterns, and health in petrochemical shift workers
Hamidreza Mokarami1, Somayeh Bolghanabadi2, Reza Kazemi3
1Department of Ergonomics, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran.
Atencion Primaria
|April 18, 2026
Summary
Shift work adaptability varies by chronotype. Evening-type workers experienced fewer health issues and better sleep quality compared to morning types in this petrochemical study.
Area of Science:
- Occupational Health
- Chronobiology
- Sleep Medicine
Background:
- Chronotype significantly influences an individual's ability to adapt to shift work schedules.
- Shift work is prevalent in industries like petrochemicals, potentially impacting worker health and well-being.
- Understanding chronotype's role is crucial for mitigating negative health outcomes associated with shift work.
Purpose of the Study:
- To investigate the relationship between chronotype, shift work-related health disorders, and sleep quality.
- To assess chronotype differences in health outcomes among shift workers in Iran's petrochemical industry.
Main Methods:
- A cross-sectional study was conducted with 250 male shift workers in a petrochemical complex.
- Data collected via Shift Work Impact on Health and Social Disorders (SOS) Questionnaire, Pittsburgh Sleep Quality Index (PSQI), Morningness-Eveningness Questionnaire (MEQ), and Cognitive Failure Questionnaire.
- Participants had at least five years of shift work experience and no major health issues or substance use.
Main Results:
- Morning-type workers exhibited higher prevalence of musculoskeletal, gastrointestinal, and cardiovascular disorders compared to evening types (p<0.05).
- Significant differences were observed in cognitive failures and sleep quality between morning-type and evening-type workers (p<0.05).
Conclusions:
- Evening-type individuals demonstrate superior adaptability to shift work and reduced susceptibility to adverse health effects.
- Circadian typology should be a key consideration in shift work assignment, particularly for safety-sensitive roles.
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