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Blue-enriched Lighting for Older People Living in Care Homes: Effect on Activity, Actigraphic Sleep, Mood and Alertness

Hopkins, Samantha, Morgan, Peter Lloyd, Schlangen, Luc J.M., Williams, Peter, Skene, Debra and Middleton, Benita (2017) Blue-enriched Lighting for Older People Living in Care Homes: Effect on Activity, Actigraphic Sleep, Mood and Alertness Current Alzheimer Research, 14 (10). pp. 1053-1062.

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Abstract

Objective: Environmental (little outdoor light; low indoor lighting) and age-related physiological factors (reduced light transmission through the ocular lens, reduced mobility) contribute to a light-deprived environment for older people living in care homes. Methods: This study investigates the effect of increasing indoor light levels with blue-enriched white lighting on objective (rest-activity rhythms, performance) and self-reported (mood, sleep, alertness) measures in older people. Eighty residents (69 female), aged 86 ± 8 yrs (mean ± SD), participated (MMSE 19 ± 6). Overhead fluorescent lighting was installed in communal rooms (n=20) of seven care homes. Four weeks of blue-enriched white lighting (17000 K ≅ 900 lux) were compared with four weeks of control white lighting (4000 K ≅ 200 lux), separated by three weeks wash-out. Participants completed validated mood and sleep questionnaires, psychomotor vigilance task (PVT) and wore activity and light monitors (AWL). Rest-activity rhythms were assessed by cosinor, non-parametric circadian rhythm (NPCRA) and actigraphic sleep analysis. Blue-enriched (17000 K) light increased wake time and activity during sleep decreasing actual sleep time, sleep percentage and sleep efficiency (p < 0.05) (actigraphic sleep). Compared to 4000 K lighting, blue-enriched 17000 K lighting significantly (p < 0.05) advanced the timing of participants’ rest-activity rhythm (cosinor), increased daytime and night-time activity (NPCRA), reduced subjective anxiety (HADA) and sleep quality (PSQI). There was no difference between the two light conditions in daytime alertness and performance (PVT). Conclusion: Blue-enriched lighting produced some positive (increased daytime activity, reduced anxiety) and negative (increased night-time activity, reduced sleep efficiency and quality) effects in older people.

Item Type: Article
Divisions : Faculty of Health and Medical Sciences > School of Biosciences and Medicine
Authors :
NameEmailORCID
Hopkins, SamanthaS.Hopkins@surrey.ac.ukUNSPECIFIED
Morgan, Peter LloydUNSPECIFIEDUNSPECIFIED
Schlangen, Luc J.M.UNSPECIFIEDUNSPECIFIED
Williams, PeterUNSPECIFIEDUNSPECIFIED
Skene, DebraD.Skene@surrey.ac.ukUNSPECIFIED
Middleton, BenitaB.Middleton@surrey.ac.ukUNSPECIFIED
Date : 7 June 2017
Identification Number : 10.2174/1567205014666170608091119
Copyright Disclaimer : Copyright © 2017 Bentham Science Publishers; For any queries, please email at epub@benthamscience.org
Uncontrolled Keywords : Care home; Light therapy; Moo;, Elderly; Rest-activity; Sleep
Depositing User : Clive Harris
Date Deposited : 11 Sep 2017 09:23
Last Modified : 11 Sep 2017 09:23
URI: http://epubs.surrey.ac.uk/id/eprint/842220

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