Physical activity and incident dementia in older Japanese adults: The Okayama study.

Abstract:

OBJECTIVE:To evaluate the association between regular physical activity and the risk of incident dementia in older Japanese adults. METHODS:This was a retrospective cohort study performed in Okayama City, Japan. Overall, 51 477 older Japanese adults were followed from 2008 to 2014. A health checkup questionnaire was used to assess regular physical activity. The Dementia Scale of long-term care insurance was used as a measure of incident dementia. Cox proportional hazard models were used to calculate adjusted hazard ratios, with their 95% confidence intervals, for the incidence of dementia across the categories of physical activity. RESULTS:During a 7-year follow-up, 13 816 subjects were considered as having incident dementia. Compared with participants who performed physical activity less than or equal to one time per week, the multivariate adjusted hazard ratio values (95% confidence intervals) for participants who performed physical activity greater than or equal to two times per week but not every day and those who performed physical activity every day were 0.79 (0.75-0.84) and 0.94 (0.89-0.98), respectively. The interaction of physical activity and sex was statistically significant (P < .01). In subgroup analysis, the multivariate-adjusted hazard ratio values (95% confidence intervals) remained low, at 0.76 (0.70-0.84) in males and 0.81 (0.76-0.87) in females who performed physical activity greater than or equal to two times per week but not every day; they were 0.82 (0.76-0.89) in males and 1.01 (0.95-1.07) in females who performed physical activity every day. CONCLUSIONS:Regular physical activity could reduce the risk of incident dementia in older Japanese adults, except females who performed physical activity every day.

authors

Liu Y,Mitsuhashi T,Yamakawa M,Sasai M,Tsuda T,Doi H,Hamada J

doi

10.1002/gps.5135

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

1429-1437

issue

10

eissn

0885-6230

issn

1099-1166

journal_volume

34

pub_type

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