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Total Daily Activity is Associated With Cognition in Older Persons

From the Rush Alzheimer's Disease Center (ASB, RSW, DAB); Departments of Neurological Sciences (ASB, RSW, DAB); and Behavioral Science (RSW), Rush University Medical Center, Chicago, IL.

Objectives: The authors tested the hypothesis that total daily physical activity is related to the level of cognition in older persons.

Design: Cross-sectional study.

Setting: Retirement communities across the Chicago metropolitan area.

Participants: Five hundred twenty-one older persons without dementia.

Measurements: Participants underwent structured evaluation of cognition and objective measures of total daily physical activity were collected using actigraphy.

Results: In a linear regression model adjusted for age, sex, and education, total daily activity was associated with a global measure of cognition. By contrast, self-report physical activity was not associated with cognition. Further analyses showed that total daily activity was related to all five cognitive subscales.

Conclusions: Objective measures of total daily physical activity were associated with a broad range of cognitive abilities in older persons. These findings support the link between physical activity and cognition in the elderly.

Key Words: Physical activity • aging • cognition