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Effect of night-shift work on cortisol circadian rhythm and melatonin levels
How night-shift work may change daily patterns of stress hormone and sleep hormone levels
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Abstract
Salivary cortisol levels were attenuated in night-shift workers during their working hours compared to day-shift workers.
- Night-shift workers exhibited a normal circadian rhythm of salivary cortisol but with reduced levels during work hours.
- Sleep duration was shorter for night workers compared to those on day shifts.
- Night workers experienced greater negative than day workers.
- Intervals between night shifts may aid in the recovery of the hypothalamic-pituitary-adrenal axis.
- Promoting sleep hygiene and healthy life habits could be beneficial for night-shift workers.
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Key numbers
3.68 hours
Sleep Duration Decrease
Average sleep duration on working days for night-shift workers
0.97%CI: 0.74; 1.21 vs. 0.21%CI: 0.15; 0.26
Cortisol Levels Comparison
Cortisol levels in day-shift vs. night-shift workers at different times
0.003
Negative
P-value for the difference in between day- and night-shift workers