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ISSN (Print): 1567-2050
ISSN (Online): 1875-5828

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Review Article

Actigraphy for Assessing Light Effects on Sleep and Circadian Activity Rhythm in Alzheimer's Dementia: A Narrative Review

Author(s): Markus Canazei*, Julian Turiaux, Stefan E. Huber, Josef Marksteiner, Ilona Papousek and Elisabeth M. Weiss

Volume 16, Issue 12, 2019

Page: [1084 - 1107] Pages: 24

DOI: 10.2174/1567205016666191010124011

Price: $65

Abstract

Background: Alzheimer's Disease (AD) is often accompanied by severe sleep problems and circadian rhythm disturbances which may to some extent be attributed to a dysfunction in the biological clock. The 24-h light/dark cycle is the strongest Zeitgeber for the biological clock. People with AD, however, often live in environments with inappropriate photic Zeitgebers. Timed bright light exposure may help to consolidate sleep- and circadian rest/activity rhythm problems in AD, and may be a low-risk alternative to pharmacological treatment.

Objective & Methods: In the present review, experts from several research disciplines summarized the results of twenty-seven light intervention studies which used wrist actigraphy to measure sleep and circadian activity in AD patients.

Results: Taken together, the findings remain inconclusive with regard to beneficial light effects. However, the considered studies varied substantially with respect to the utilized light intervention, study design, and usage of actigraphy. The paper provides a comprehensive critical discussion of these issues.

Conclusion: Fusing knowledge across complementary research disciplines has the potential to critically advance our understanding of the biological input of light on health and may contribute to architectural lighting designs in hospitals, as well as our homes and work environments.

Keywords: Light, dementia, actigraphy, sleep, circadian rhythm, physical activity.

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