Physical Activity Is Associated with Incident Disability in Community-Based Older Persons

Authors

  • Patricia A. Boyle PhD,

    1. From the *Rush Alzheimer's Disease Center, Department of Behavioral Sciences, Department of Neurological Sciences, §Department of Internal Medicine, and Rush Institute for Healthy Aging, Rush University Medical Center, Chicago, Illinois.
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  • Aron S. Buchman MD,

    1. From the *Rush Alzheimer's Disease Center, Department of Behavioral Sciences, Department of Neurological Sciences, §Department of Internal Medicine, and Rush Institute for Healthy Aging, Rush University Medical Center, Chicago, Illinois.
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  • Robert S. Wilson PhD,

    1. From the *Rush Alzheimer's Disease Center, Department of Behavioral Sciences, Department of Neurological Sciences, §Department of Internal Medicine, and Rush Institute for Healthy Aging, Rush University Medical Center, Chicago, Illinois.
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  • Julia L. Bienias ScD,

    1. From the *Rush Alzheimer's Disease Center, Department of Behavioral Sciences, Department of Neurological Sciences, §Department of Internal Medicine, and Rush Institute for Healthy Aging, Rush University Medical Center, Chicago, Illinois.
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  • David A. Bennett MD

    1. From the *Rush Alzheimer's Disease Center, Department of Behavioral Sciences, Department of Neurological Sciences, §Department of Internal Medicine, and Rush Institute for Healthy Aging, Rush University Medical Center, Chicago, Illinois.
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Address correspondence to Patricia A. Boyle, PhD, Rush Alzheimer's Disease Center, 600 S. Paulina, 1020B, Chicago, IL 60612. E-mail: patricia_boyle@rush.edu

Abstract

OBJECTIVES: To examine the association between physical activity and the risk of incident disability, including impairment in activities of daily living (ADLs) and instrumental activities of daily living (IADLs), in community-based older persons free of dementia.

DESIGN: Prospective, observational cohort study.

SETTING: Approximately 40 retirement communities across the Chicago metropolitan area.

PARTICIPANTS: More than 1,000 older persons from the Rush Memory and Aging Project, an ongoing longitudinal clinical-pathological study of common chronic conditions of old age.

MEASUREMENTS: All participants underwent detailed annual clinical evaluations that included assessments of physical activity, ADLs, IADLs, and gait performance. The associations between physical activity, mortality, and incident disability were examined using a series of Cox proportional hazards models controlled for age, sex, education, and baseline gait.

RESULTS: At baseline, participants spent a mean±standard deviation of 3.0±3.5 hours per week engaging in physical activity (range 0–35). In a proportional hazards model, the risk of death decreased 11% (hazard ratio (HR)=0.89, 95% confidence interval (CI)=0.83–0.95) for each additional hour of physical activity per week. For those who were not disabled at baseline, the risk of developing disability in ADLs decreased 7% (HR=0.93, 95% CI=0.88–0.98) for each additional hour of physical activity per week. Similarly, the risk of disability in IADLs decreased 7% (HR=0.93, 95% CI=0.89–0.99) for each additional hour of physical activity.

CONCLUSION: For community-based older persons without dementia, physical activity is associated with maintenance of functional status, including a reduced risk of developing impairment in ADLs and IADLs.

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