L’exposition contrôlée à la lumière et à l’obscurité ajuste le rythme du cortisol salivaire chez les travailleurs de nuit
The efficacy of a light/darkness intervention designed to promote circadian adaptation to night shift work was tested in this combined field and laboratory study. Six permanent night shift workers (mean age : 37.1 / s : 8.1 years) were instructed to expose themselves intermittently to full-spectrum...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Institut de Recherche Robert-Sauvé en Santé et en Sécurité du Travail (IRSST)
2005-05-01
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| Series: | Perspectives Interdisciplinaires sur le Travail et la Santé |
| Subjects: | |
| Online Access: | https://journals.openedition.org/pistes/3200 |
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| Summary: | The efficacy of a light/darkness intervention designed to promote circadian adaptation to night shift work was tested in this combined field and laboratory study. Six permanent night shift workers (mean age : 37.1 / s : 8.1 years) were instructed to expose themselves intermittently to full-spectrum bright white light (~2,000 lux) in the first 6 hours of their 8-hour shift. They were asked to shield themselves from morning sunlight with tinted lenses (neutral grey density, 15 % visual light transmission), and to maintain regular sleep/darkness episodes in darkened quarters beginning 2 hours after the end of each night shift. Five control group workers (41.1 / s : 9.9 years) were observed in the presence of a regular sleep/darkness schedule only. Constant routines performed before and after a sequence of ~12 night shifts over 3 weeks revealed that treatment group workers displayed significant shifts in the time of peak cortisol expression and a realignment of the rhythm with the night-oriented schedule. Smaller phase shifts suggesting an incomplete adaptation to the shift work schedule were observed in the control group. Our observations support a careful control of the pattern of light and darkness exposure for the adaptation of physiological rhythms to night shift work. |
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| ISSN: | 1481-9384 |