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Physical activity may not be associated with long‐term risk of dementia and Alzheimer’s disease
Author(s) -
Kunutsor Setor K.,
Laukkanen Jari A.,
Kauhanen Jussi,
Willeit Peter
Publication year - 2021
Publication title -
european journal of clinical investigation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.164
H-Index - 107
eISSN - 1365-2362
pISSN - 0014-2972
DOI - 10.1111/eci.13415
Subject(s) - medicine , hazard ratio , dementia , interquartile range , body mass index , proportional hazards model , prospective cohort study , alzheimer's disease , population , blood pressure , confidence interval , diabetes mellitus , gerontology , disease , endocrinology , environmental health
Background While it is well established that physical activity is associated with reduced risk of vascular and nonvascular outcomes as well as mortality, evidence on the association between physical activity and dementia is inconsistent. We aimed to assess the associations of physical activity with the risk of dementia and Alzheimer's disease (AD). Material and methods We analysed data on 2394 apparently healthy men with good baseline cognitive function from the prospective population‐based Kuopio Ischaemic Heart Disease study. We assessed habits of physical activity at baseline using a 12‐month leisure time physical activity (LTPA) questionnaire. Using Cox regression, we calculated hazard ratios adjusted for body mass index, systolic blood pressure, smoking status, history of type‐2 diabetes, total cholesterol, high‐density lipoprotein cholesterol, alcohol consumption, history of coronary heart disease and high‐sensitivity C‐reactive protein. Results During a median follow‐up of 24.9 years (interquartile range: 18.3‐26.9), 208 men developed dementia and 128 developed AD. Multivariable adjusted hazard ratios for dementia comparing top vs bottom tertiles of physical activity were 0.97 (95% confidence intervals: 0.69‐1.38) for total physical activity volume, 0.96 (0.69‐1.34) for conditioning LTPA volume and 1.13 (0.80‐1.61) for total LTPA volume. Corresponding hazard ratios for AD were 1.19 (0.76‐1.85), 0.98 (0.64‐1.49) and 1.22 (0.77‐1.93). Associations were consistent in analyses restricted to participants with ≥10 years of follow‐up. Conclusions In middle‐aged Caucasian men, various physical activity exposures were not associated with all‐cause dementia or AD. Future studies should address biases due to reverse causation and regression dilution and should involve objective measures of physical activity.