Cited by 621Circadian rhythm and melatoninSleep and Work-Related FatigueSleep and related disorders

Alterations in the circadian rest-activity rhythm in aging and Alzheimer's disease

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Witting, W., Kwa, I.H., Eikelenboom, P., Mirmiran, M., Swaab, D.F.·1990·Biological Psychiatry

Abstract

The suprachiasmatic nucleus, considered to be the endogenous circadian clock in the mammalian brain, shows morphological changes with aging, which become even more pronounced in Alzheimer's disease (AD). In order to assess possible functional implications of these alterations, circadian rest-activity rhythms of 6 young and 13 old volunteers and of 12 AD patients were studied with a recently developed ambulatory rest-activity monitor (RA24). Young and old volunteers showed no differences in their rest-activity rhythm in any of the variables studied. Comparison of old controls versus AD patients revealed that (1) rest-activity rhythm was markedly disturbed in many of the AD patients and tended to be correlated with the severity of the dementia; (2) disturbances were most pronounced in subjects using sedating drugs; (3) disturbances in the latter group did not result from medication as no differences were found in the rest-activity patterns before and after administration of sedating drugs; (4) negative findings reported in the literature concerning circadian disturbances in AD may well have resulted from selection criteria that excluded the group of patients with the most severely affected rest-activity rhythm; and (5) rest-activity monitors offer a practical and fruitful approach for the study of circadian rhythms in humans.

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  • The idea of combining prolonged-release melatonin with AChEIs came from the observed relation between circadian rhythm dysfunction and neurocognitive disorders, a phenomenon observed as a consequence of decreased circulating melatonin level.

    “The idea of the drug combination came from the observed relation between circadian rhythm dysfunction and neurocognitive disorders, a phenomenon that has been observed as consequence of the decreased circulating melatonin (11) level (Figure 6B).76,77”

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Authors
Witting, W., Kwa, I. H., Eikelenboom, P., Mirmiran, M., & Swaab, D. F.
Corresponding author
Witting, W.
Venue
Biological Psychiatry
Publisher
Elsevier BV
Published
1990-03
Volume
27
Issue
6
Pages
563-572
ISSN
0006-3223 (ISSN-L)
OpenAlex
W1983882084
Cited by
621
References
23
Citations by year
2026: 29 · 2025: 38 · 2024: 41 · 2023: 39 · 2022: 35 · 2021: 48 · 2020: 40 · 2019: 37 · 2018: 27 · 2017: 19 · 2016: 17 · 2015: 22 · 2014: 16 · 2013: 16 · 2012: 11
FWCI
7.88
Type
journal article
Language
en
Open access
Locations
  • Biological Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
  • KNAW research portal (Royal Academy of Art and Sciences (KNAW)) (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
  • Pure Amsterdam UMC (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
Keywords
circadian rest-activity rhythm, Alzheimer's disease, aging, suprachiasmatic nucleus, circadian clock, dementia severity, circadian rhythm disruption
MeSH terms
Adult, Aged, Aged, 80 and over, Aging, Alzheimer Disease, Arousal, Circadian Rhythm, Female, Humans, Male, Middle Aged, Motor Activity, Reference Values, Sleep Stages, Suprachiasmatic Nucleus

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