Format

Send to:

Choose Destination
See comment in PubMed Commons below
J Am Geriatr Soc. 2007 Oct;55(10):1618-23. Epub 2007 Aug 14.

Physical activity and leg strength predict decline in mobility performance in older persons.

Author information

  • 1Alzheimer's Disease Center, Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois 60612, USA. Aron_S_Buchman@rush.edu

Abstract

OBJECTIVES:

To assess the extent to which physical activity and leg strength are associated with change in mobility in older persons.

DESIGN:

Prospective, observational cohort study.

SETTING:

Retirement communities across the Chicago metropolitan area participating in the Rush Memory and Aging Project.

PARTICIPANTS:

Eight hundred eighty-six ambulatory older persons without dementia.

MEASUREMENT:

Rate of change in mobility.

RESULTS:

In a linear mixed-effects model that controlled for age, sex, education, and a term for baseline physical activity, a higher level of physical activity was associated with a slower rate of mobility decline (estimate=0.006, standard error (SE)=0.003, P=.03); each additional hour of physical activity at baseline was associated with an approximately 3% decrease in the rate of mobility decline. In a similar model, a higher level of baseline leg strength was associated with a slower rate of mobility decline (estimate=0.031, SE=0.132, P=.02); each additional unit of leg strength at baseline was associated with an approximately 20% decrease in the rate of mobility decline. In a final model, which included terms for physical activity and leg strength together, both were associated with decline in mobility. Furthermore, both remained associated with mobility even after controlling for body composition, balance, pulmonary function, cognition, history of joint pain, cardiovascular diseases and risk factors, and medications.

CONCLUSION:

Physical activity and leg strength are relatively independent predictors of mobility decline in older persons. Although physical activity may improve strength, the beneficial effect of physical activity on mobility is likely to involve other pathways.

PMID:
17697103
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Wiley
    Loading ...
    Write to the Help Desk