Circadian activity rhythms and risk of incident dementia and mild cognitive impairment in older women
Year: 2011
Type: article
Study design: Observational Study
Abstract: OBJECTIVE: Previous cross-sectional studies have observed alterations in activity rhythms in dementia patients but the direction of causation is unclear. We determined whether circadian activity rhythms measured in community-dwelling older women are prospectively associated with incident dementia or mild cognitive impairment (MCI). METHODS: Activity rhythm data were collected from 1,282 healthy community-dwelling women from the Study of Osteoporotic Fractures (SOF) cohort (mean age 83 years) with wrist actigraphy for a minimum of three 24-hour periods. Each participant completed a neuropsychological test battery and had clinical cognitive status (dementia, MCI, normal) adjudicated by an expert panel approximately 5 years later. All analyses were adjusted for demographics, body mass index (BMI), functional status, depression, medications, alcohol, caffeine, smoking, health status, and comorbidities. RESULTS: After 4.9 years of follow-up, 195 (15%) women had developed dementia and 302 (24%) had developed MCI. Older women with decreased activity rhythms had a higher likelihood of developing dementia or MCI when comparing those in the lowest quartiles of amplitude (odds ratio [OR] = 1.57; 95% CI, 1.09-2.25) or rhythm robustness (OR = 1.57; 95% CI, 1.10-2.26) to women in the highest quartiles. An increased risk of dementia or MCI (OR = 1.83; 95% CI, 1.29-2.61) was found for women whose timing of peak activity occurred later in the day (after 3:51 PM) when compared to those with average timing (1:34 PM-3:51 PM). INTERPRETATION: Older, healthy women with decreased circadian activity rhythm amplitude and robustness, and delayed rhythms have increased odds of developing dementia and MCI. If confirmed, future studies should examine whether interventions (physical activity, bright light exposure) that influence activity rhythms will reduce the risk of cognitive deterioration in the elderly.
Source: Annals of Neurology
DOI: 10.1002/ana.22468
Institutions: California Pacific Medical Center, University of California San Diego, University of Minnesota, Minneapolis VA Medical Center, University of Pittsburgh, Brigham and Women's Hospital, Beth Israel Deaconess Medical Center, Harvard University, Kaiser Permanente Center for Health Research, San Francisco VA Medical Center, University of California, San Francisco
Language: English
Subfield: Psychiatry and Mental health
Field: Medicine
Domain: Health Sciences
Open Access status: green
Awards: G106845381, G1189072775, G1439824551, G177655820, G1799502371, G2060701114, G2091924775, G2319467481, G2661604817, G3178576828, G3835417588, G4118007464, Study of Osteoporotic Fractures, Study of Osteoporotic Fractures (SOF)-Pittsburgh Clinic, Predictors of cognitive aging across the lifecourse, G5098571776, G568820375, G6567779045, G661739587, G7119182916, G76550502, G7858327901, G8563178186, G8752836037
OpenAlex ID: W2034831738