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J Am Geriatr Soc. 2007 Feb;55(2):195-201.

Physical activity is associated with incident disability in community-based older persons.

Author information

  • 1Rush Alzheimer's Disease Center, Rush University Medical Center, Chicago, Illinois 60612, USA. 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.

PMID:
17302655
[PubMed - indexed for MEDLINE]
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