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Effects of bright light on cognitive and sleep–wake (circadian) rhythm disturbances in Alzheimer‐type dementia
Abstract
Twenty‐seven patients with Alzheimer‐type dementia (ATD) were treated with bright light therapy in the morning for four consecutive weeks. The cognitive state of each patient was evaluated with the Mini‐Mental‐State Examination (MMSE) and circadian rhythm with actigram before and after therapy for all of the patients and those of two groups divided by the severity criteria of the Clinical Dementia Rating. The therapy improved the circadian rhythm disturbances. Although the therapy caused no remarkable effects on dementia severity, it improved the MMSE scores, especially in the early stages of ATD. These results suggest that bright light therapy improved the circadian rhythm disturbances and then bettered the cognitive state in early‐stage ATD.
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“some studies indicate that morning light therapy may improve circadian rhythms and Mini-Mental State examination (MMSE), Cohen-Mansfield Agitation Inventory (CMAI) and Behaviour Pathology in AD Rating Scale (BEHAVEAD) scores, particularly in the early stages of dementia, and that, even in severe cases of dementia, it improves circadian and behavioural symptoms, most notably agitation and overall”
From Rhythms of life: circadian disruption and brain disorders across the lifespan (2019) · cites this paper as [297]
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Metadata
- Authors
- Yamadera, H., Ito, T., Suzuki, H., Asayama, K., Ito, R., & Endo, S.
- Affiliations
- Nippon Medical School (JP)
- Venue
- Psychiatry and Clinical Neurosciences
- Publisher
- Wiley
- Published
- 2000-06
- Volume
- 54
- Issue
- 3
- Pages
- 352-353
- ISSN
- 1323-1316 (ISSN-L)
- 1440-1819
- OpenAlex
- W2044512913
- Cited by
- 148
- References
- 4
- Citations by year
- 2026: 7 · 2025: 5 · 2024: 4 · 2023: 12 · 2022: 8 · 2021: 11 · 2020: 11 · 2019: 6 · 2018: 7 · 2017: 6 · 2016: 4 · 2015: 5 · 2014: 7 · 2013: 7 · 2012: 7
- FWCI
- 1.43
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Psychiatry and Clinical Neurosciences (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Health Sciences › Medicine › Critical Care and Intensive Care Medicine › Intensive Care Unit Cognitive Disorders
- Keywords
- bright light therapy, Alzheimer-type dementia, circadian rhythm disruption, sleep-wake cycle, cognitive function, dementia severity, early-stage dementia, actigraphy, Mini-Mental State Examination
- MeSH terms
- Aged, Aged, 80 and over, Alzheimer Disease, Female, Humans, Male, Mental Status Schedule, Neuropsychological Tests, Phototherapy, Treatment Outcome, Polysomnography, Sleep Disorders, Circadian Rhythm
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