Efficacy of intermittent exposure to bright light for treating maladaptation to night work on a counterclockwise shift work rotation
| Autor: | Wei Wang, John Wise, Charles A. Czeisler, Todd S. Horowitz, Joseph M. Ronda, Heidi M Lammers-van der Holst, Jeanne F. Duffy, James K. Wyatt |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Adult
medicine.medical_specialty night shift Evening Light media_common.quotation_subject Adaptation (eye) melatonin Audiology night work Melatonin Shift work Cognition Work Schedule Tolerance counterclockwise shift medicine Humans Circadian rhythm Maladaptation media_common Psychomotor learning circadian phase business.industry Public Health Environmental and Occupational Health bright light exposure to bright light Shift Work Schedule Circadian Rhythm sustained attention shift work Female Original Article shift worker Public aspects of medicine RA1-1270 Sleep business medicine.drug Vigilance (psychology) |
| Zdroj: | Scandinavian Journal of Work, Environment & Health, Vol 47, Iss 5, Pp 356-366 (2021) Scandinavian Journal of Work, Environment & Health |
| ISSN: | 0355-3140 |
| Popis: | Objectives Rotating shift work is associated with adverse outcomes due to circadian misalignment, sleep curtailment, work-family conflicts, and other factors. We tested a bright light countermeasure to enhance circadian adaptation on a counterclockwise rotation schedule. Methods Twenty-nine adults (aged 20–40 years; 15 women) participated in a 4-week laboratory simulation with weekly counterclockwise transitions from day, to night, to evening, to day shifts. Each week consisted of five 8-hour workdays including psychomotor vigilance tests, two days off, designated 8-hour sleep episodes every day, and an assessment of circadian melatonin secretion. Participants were randomized to a treatment group (N=14), receiving intermittent bright light during work designed to facilitate circadian adaptation, or a control group (N=15) working in indoor light. Adaptation was measured by how much of the melatonin secretion episode overlapped with scheduled sleep timing. Results On the last night shift, there was a greater overlap between melatonin secretion and scheduled sleep time in the treatment group [mean 4.90, standard deviation (SD) 2.8 hours] compared to the control group (2.62, SD 2.8 hours; P=0.002), with night shift adaptation strongly influenced by baseline melatonin timing (r 2 =-0.71, P=0.01). While the control group exhibited cognitive deficits on the last night shift, the treatment group’s cognitive deficits on the last night and evening shifts were minimized. Conclusions In this laboratory setting, intermittent bright light during work hours enhanced adaptation to night work and subsequent readaptation to evening and day work. Light regimens scheduled to shift circadian timing should be tested in actual shift workers on counterclockwise schedules as a workplace intervention. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|