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Am J Clin Nutr. 2011 Aug;94(2):385-91. doi: 10.3945/ajcn.110.008995. Epub 2011 Jun 8.

Fat mass modifies the association of fat-free mass with symptom-limited treadmill duration in the Coronary Artery Risk Development in Young Adults (CARDIA) Study.

Author information

1
Division of Epidemiology, School of Public Health, University of Minnesota, Minneapolis, MN 55454, USA.

Abstract

BACKGROUND:

The assessment of fat mass and fat-free mass in relation to the symptom-limited maximal exercise duration (Max(dur)) of a treadmill test allows for insight into the association of body composition with treadmill performance potential.

OBJECTIVE:

We investigated the complex associations between fat mass and fat-free mass and Max(dur) in a population setting.

DESIGN:

The Max(dur) of a graded exercise treadmill test and body composition by dual-energy X-ray absorptiometry were estimated in 2413 black and white men and women aged 38-50 y from the Coronary Artery Risk Development in Young Adults (CARDIA) cohort.

RESULTS:

The mean Max(dur) was ≈7.5 s shorter per kilogram of fat mass in both men and women and independent of fat-free mass, height, race, television watching, physical activity, systolic blood pressure, lung function, and education. Fat mass modified the association of fat-free mass with the Max(dur) (2-way interaction P < 0.001), and the interaction was stronger in women than in men. In men in the lowest fat-mass quartile, the Max(dur) was 1.3 s longer per kilogram of fat-free mass and was 0.5 s shorter per kilogram of fat-free mass in the highest fat-mass quartile. In contrast, in women with the least fat mass, the Max(dur) was 2.7 s longer per kilogram of fat-free mass and was 2.8 s shorter per kilogram of fat-free mass in the highest fat-mass quartile.

CONCLUSIONS:

The Max(dur) was negatively related to fat mass. Fat-free mass in obese people contributed little to the treadmill performance potential as assessed by the Max(dur), although the contribution of fat-free mass was positive in thinner people.

PMID:
21653799
PMCID:
PMC3142718
DOI:
10.3945/ajcn.110.008995
[Indexed for MEDLINE]
Free PMC Article
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