Differences in twenty-four-hour profiles of blue-light exposure between day and night shifts in female medical staff
Autor: | Dirk Pallapies, Thomas Behrens, Céline Vetter, Martin Lehnert, Simone Putzke, Thomas Kantermann, Volker Harth, Alexandra Beine, J. W. Walther, Katarzyna Burek, Thomas Brüning, Rui Wang-Sattler, Sylvia Rabstein |
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Rok vydání: | 2019 |
Předmět: |
Adult
Environmental Engineering Evening 010504 meteorology & atmospheric sciences 010501 environmental sciences 01 natural sciences Shift work Animal science Germany Zeitgeber Humans Environmental Chemistry Medicine Circadian rhythm Waste Management and Disposal 0105 earth and related environmental sciences Blue light Morning business.industry Shift Work Schedule Chronotype Middle Aged Radiation Exposure Pollution Circadian Rhythm Personnel Hospital Darkness Linear Models Female business |
Zdroj: | Science of The Total Environment. 653:1025-1033 |
ISSN: | 0048-9697 |
Popis: | Light is the strongest zeitgeber currently known for the synchronization of the human circadian timing system. Especially shift workers are exposed to altered daily light profiles. Our objective is the characterization of differences in blue-light exposures between day and night shift taking into consideration modifying factors such as chronotype. We describe 24-hour blue-light profiles as measured with ambient light data loggers (LightWatcher) during up to three consecutive days with either day or night shifts in 100 female hospital staff including 511 observations. Linear mixed models were applied to analyze light profiles and to select time-windows for the analysis of associations between shift work, individual factors, and log mean light exposures as well as the duration of darkness per day. Blue-light profiles reflected different daily activities and were mainly influenced by work time. Except for evening (7–9 p.m.), all time windows showed large differences in blue-light exposures between day and night shifts. Night work reduced the duration of darkness per day by almost 4 h ( β ^ = −3:48 hh:mm, 95% CI (−4:27; −3.09)). Late chronotypes had higher light exposures in the morning and evening compared to women with intermediate chronotype (e.g. morning β ^ = 0.50 log(mW/m2/nm), 95% CI (0.08; 0.93)). Women with children had slightly higher light exposures in the afternoon than women without children ( β ^ = 0.48, 95% CI (−0.10; 1,06)). Time windows for the description of light should be chosen carefully with regard to timing of shifts. Our results are helpful for future studies to capture relevant light exposure differences and potential collinearities with individual factors. Improvement of well-being of shift workers with altered light profiles may therefore require consideration of both – light at the workplace and outside working hours. |
Databáze: | OpenAIRE |
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