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The Effect of Bright Light Treatment on Rest–Activity Rhythms in People with Dementia: A 24-Week Cluster Randomized Controlled Trial

1
Department of Clinical Psychology, Faculty of Psychology, University of Bergen (UiB), 5009 Bergen, Norway
2
Department of Psychosocial Science, Faculty of Psychology, University of Bergen (UiB), 5015 Bergen, Norway
3
Norwegian Competence Center for Sleep Disorders, Haukeland University Hospital, 5021 Bergen, Norway
4
Optentia, The Vaal Triangle Campus of the North-West University, Vanderbijlpark 1911, South Africa
5
City Department of Health and Care, 5007 Bergen, Norway
6
Department of Behavioural Medicine, Faculty of Medicine, University of Oslo (UiO), 0372 Oslo, Norway
*
Author to whom correspondence should be addressed.
Academic Editors: Christian Cajochen and Joan Santamaria
Clocks & Sleep 2021, 3(3), 449-464; https://doi.org/10.3390/clockssleep3030032
Received: 7 August 2021 / Revised: 3 September 2021 / Accepted: 8 September 2021 / Published: 13 September 2021
(This article belongs to the Section Clocks & Sleep and Disorders)
Bright light treatment is an effective way to influence circadian rhythms in healthy adults, but previous research with dementia patients has yielded mixed results. The present study presents a primary outcome of the DEM.LIGHT trial, a 24-week randomized controlled trial conducted at nursing homes in Bergen, Norway, investigating the effects of a bright light intervention. The intervention consisted of ceiling-mounted LED panels providing varying illuminance and correlated color temperature throughout the day, with a peak of 1000 lx, 6000 K between 10 a.m. and 3 p.m. Activity was recorded using actigraphs at baseline and after 8, 16, and 24 weeks. Non-parametric indicators and extended cosine models were used to investigate rest–activity rhythms, and outcomes were analyzed with multi-level regression models. Sixty-one patients with severe dementia (median MMSE = 4) were included. After 16 weeks, the acrophase was advanced from baseline in the intervention group compared to the control group (B = −1.02, 95%; CI = −2.00, −0.05). There was no significant difference between the groups on any other rest–activity measures. When comparing parametric and non-parametric indicators of rest–activity rhythms, 25 out of 35 comparisons were significantly correlated. The present results indicate that ambient bright light treatment did not improve rest–activity rhythms for people with dementia. View Full-Text
Keywords: dementia; nursing homes; bright light therapy; rest–activity rhythms; actigraphy; circadian rhythms; clinical trial dementia; nursing homes; bright light therapy; rest–activity rhythms; actigraphy; circadian rhythms; clinical trial
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MDPI and ACS Style

Kolberg, E.; Pallesen, S.; Hjetland, G.J.; Nordhus, I.H.; Flo-Groeneboom, E. The Effect of Bright Light Treatment on Rest–Activity Rhythms in People with Dementia: A 24-Week Cluster Randomized Controlled Trial. Clocks & Sleep 2021, 3, 449-464. https://doi.org/10.3390/clockssleep3030032

AMA Style

Kolberg E, Pallesen S, Hjetland GJ, Nordhus IH, Flo-Groeneboom E. The Effect of Bright Light Treatment on Rest–Activity Rhythms in People with Dementia: A 24-Week Cluster Randomized Controlled Trial. Clocks & Sleep. 2021; 3(3):449-464. https://doi.org/10.3390/clockssleep3030032

Chicago/Turabian Style

Kolberg, Eirin, Ståle Pallesen, Gunnhild J. Hjetland, Inger H. Nordhus, and Elisabeth Flo-Groeneboom. 2021. "The Effect of Bright Light Treatment on Rest–Activity Rhythms in People with Dementia: A 24-Week Cluster Randomized Controlled Trial" Clocks & Sleep 3, no. 3: 449-464. https://doi.org/10.3390/clockssleep3030032

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