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Circadian characteristics influencing interindividual differences in tolerance and adjustment to shiftwork
Ergonomics
|April 1, 1989
Summary
Shiftworkers with better tolerance exhibit flexible sleep habits and less anxiety, independent of circadian rhythm adjustments. Digestive issues in shiftworkers may link short-term circadian changes to long-term tolerance problems.
Area of Science:
- Occupational Health
- Chronobiology
- Psychophysiology
Background:
- Shiftwork affects millions globally, posing challenges to circadian rhythms and worker well-being.
- Individual differences in tolerance to shiftwork are observed, but underlying factors require further investigation.
Purpose of the Study:
- To investigate differences in circadian adjustments and behavioral characteristics among shiftworkers with varying long-term tolerance.
- To explore the relationship between specific traits and the ability to adapt to shiftwork schedules.
Main Methods:
- Three groups of shiftworkers (n=24) were categorized based on shiftwork tolerance: no complaints, nervous complaints, or digestive disorders.
- Participants completed questionnaires on lifestyle and psychological factors and recorded physiological data (oral temperature, sleep hours) during day and night shifts.
Main Results:
- Flexibility in sleeping habits, ability to overcome drowsiness, and lower manifest anxiety correlated with better shiftwork tolerance.
- Morningness influenced circadian adjustments and sleep patterns but not long-term tolerance.
- Workers with digestive disorders exhibited greater circadian phase shifts and amplitude reduction during night shifts.
Conclusions:
- Behavioral traits like sleep flexibility and lower anxiety are key to shiftwork tolerance.
- Circadian rhythm adjustment during shiftwork, particularly in those with digestive issues, may indicate underlying mechanisms affecting long-term adaptation.