The influence of indoor lighting with low blue light dose on urine 6-sulphatoxymelatonin concentrations and sleep efficiency of healthy volunteers |
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| Authors: | Katarína Stebelová Ľuboš Molčan Monika Okuliarová Peter Hanuliak Peter Hartman Jozef Hraška |
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| Affiliation: | 1. Faculty of Natural Sciences, Department of Animal Physiology and Ethology, Comenius University, Bratislava, Slovak Republic;2. Faculty of Civil Engineering, Department of Building Structures, Slovak University of Technology, Bratislava, Slovak Republic |
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| Abstract: | Light, especially its blue component, is the main synchronizer of circadian rhythms. We investigated effects of suppressed blue band of the spectrum on melatonin production and sleep efficiency in 18 young volunteers. During control days, participants lived in their home environment, and next five days in a room lit only by daylight with windows equipped with a filter blocking the blue band of the light spectrum. Light intensity, circadian stimulus and light irradiance were monitored. No significant changes in the daily pattern and total urinary 6-sulphatoxymelatonin excretion were found between control and experimental conditions. Parameters of sleep efficiency measured by wrist actigraphy were not worsened, but neutral chronotypes exhibited shortened sleep duration under light-modified conditions. We conclude that young healthy people can compensate for negative effects of transitory-worsened lighting conditions on their daily rhythms, but chronotypes and other personal characteristics may modify biological responses and should be considered. |
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| Keywords: | blue light suppression melatonin 6-sulphatoxymelatonin wrist actigraphy chronotype |
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