Title |
Implications of controlled short-wavelength light exposure for sleep in older adults
|
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Published in |
BMC Research Notes, September 2011
|
DOI | 10.1186/1756-0500-4-334 |
Pubmed ID | |
Authors |
Mariana G Figueiro, Natalia Z Lesniak, Mark S Rea |
Abstract |
Environmental and physiological conditions make older adults more likely to lose synchronization to their local time and experience sleep disturbances. A regular, 24-hour light/dark cycle promotes synchronization. It is now well established that the circadian system is maximally sensitive to short-wavelength (blue) light. The purpose of the present study was to measure dose effectiveness (amounts and durations) of short-wavelength (blue) light for stimulating the circadian systems of older adults. We investigated the impact of six corneal irradiances (0.7 to 72 μW/cm2) of 470-nm light on nocturnal melatonin production. Nine participants, each over 50 years of age completed a within-subjects study. Each week, participants were exposed to one of the six irradiances of 470-nm light for 90 minutes. |
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