The effect of midlife physical activity on cognitive function among older adults: AGES--Reykjavik Study.

ABSTRACT:

Background

There are few studies on the long-term associations of physical activity (PA) to cognition. Here, we examine the association of midlife PA to late-life cognitive function and dementia.

Methods

The sample consisted of a population-based cohort of men and women (born in 1907-1935) participating in the Age Gene/Environment Susceptibility-Reykjavik Study. The interval between the midlife ascertainment of PA and late-life cognitive function was 26 years. Composite scores of speed of processing, memory, and executive function were assessed with a battery of neuropsychological tests, and dementia was diagnosed according to international guidelines. There were 4,761 nondemented participants and 184 (3.7%) with a diagnosis of dementia, with complete data for the analysis.

Results

Among the participants, no midlife PA was reported by 68.8%, ? 5 hours PA by 26.5%, and >5 hours PA by 4.5%. Excluding participants with dementia compared with the no PA group, both PA groups had significantly faster speed of processing (? 5 hours, ? = .22; >5 hours, ? = .32, p trend < .0001), better memory (? 5 hours, ? = .15; >5 hours, ? = .18, p trend < .0001), and executive function (? 5 hours, ? = .09; >5 hours, ? = .18, p trend< .0001), after controlling for demographic and cardiovascular factors. The ? 5 hours PA group was significantly less likely to have dementia in late life (odds ratio: 0.6, 95% confidence interval: 0.40-0.88) after adjusting for confounders.

Conclusion

Midlife PA may contribute to maintenance of cognitive function and may reduce or delay the risk of late-life dementia.

SUBMITTER: Chang M 

PROVIDER: S-EPMC2990266 | biostudies-literature | 2010 Dec

REPOSITORIES: biostudies-literature