Clinical Medicine: Geriatrics   

Andrew W. Gardner^1,2 and Polly S. Montgomery^1,2

¹CMRI Metabolic Research Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK. ²Department of Medicine, Division of Gerontology, University of Maryland, Baltimore, MD.

Abstract

Purposes:  (a) To compare exercise performance and leisure-time physical activity (LTPA) between older Caucasians and African-Americans, (b) to assess the relationship between exercise performance and LTPA, and (c) to determine whether group differences in exercise performance persist after adjusting for differences in LTPA.

Methods:  A total of 207 Caucasians and 160 African-Americans who were 65 years of age and older participated in this study. Subjects were characterized on exercise performance by a 6-minute walk test, and by a short physical performance battery (SPPB) score consisting of a repeated chair rise test, a standing balance test, and a 4-meter walk test. Additionally, LTPA was assessed using the Minnesota LTPA questionnaire.

Results:  African-Americans had a 5% lower SPPB value ( p    0.009), a 14% shorter 6-minute walk distance ( p    0.001), and a 34% lower LTPA value ( p    0.020). LTPA was significantly related ( p    0.01) to both SPPB and 6-minute walk distance in both groups. Differences in SPPB and 6-minute walk distance between older Caucasians and African-Americans were no longer present ( p    0.05) after controlling for LTPA.

Conclusions:  Older African-Americans had impaired exercise performance and lower LTPA compared to older Caucasians. Racial differences in exercise performance were no longer present after adjusting for differences in LTPA.