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- W2148289250 abstract "Light exposure was measured in 30 permanent night nurses to determine if specific light/dark profiles could be associated with a better circadian adaptation. Circadian adaptation was defined as a significant shift in the timing of the episode of melatonin secretion into the daytime. Light exposure was continuously recorded with ambulatory wrist monitors for 56 h, including 3 consecutive nights of work. Participants were then admitted to the laboratory for 24 h where urine was collected every 2 h under dim light for the determination of 6-sulphatoxymelatonin concentration. Cosinor analysis was used to estimate the phase position of the episode of melatonin secretion. Five participants showed a circadian adaptation by phase delay (delayed participants) and 3 participants showed a circadian adaptation by phase advance (advanced participants). The other 22 participants had a timing of melatonin secretion typical of day-oriented people (nonshifters). There was no significant difference between the 3 groups for total light exposure or for bright light exposure in the morning when traveling home. However, the 24-h profiles of light exposure were very distinctive. The timing of the main sleep episode was associated with the timing of light exposure. Delayed participants, however, slept in darker bedrooms, and this had a major impact on their profile of light/dark exposure. Delayed and advanced participants scored as evening and morning types, respectively, on a morningness-eveningness scale. This observation suggests that circadian phase prior to night work may contribute to the initial step toward circadian adaptation, later reinforced by specific patterns of light exposure." @default.
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- W2148289250 date "2001-10-01" @default.
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- W2148289250 title "Profile of 24-h Light Exposure and Circadian Phase of Melatonin Secretion in Night Workers" @default.
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- W2148289250 doi "https://doi.org/10.1177/074873001129002178" @default.
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