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Am J Clin Nutr. 2005 May;81(5):964-9.

Physical activity energy expenditure predicts changes in body composition in middle-aged healthy whites: effect modification by age.

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  • 1Medical Research Council Epidemiology Unit, Cambridge, United Kingdom. ue202@medschl.cam.ac.uk

Abstract

BACKGROUND:

It is unclear whether physical activity energy expenditure (PAEE) predicts changes in body composition.

OBJECTIVE:

The objective was to describe the independent associations between PAEE and changes in body composition in a population-based cohort.

DESIGN:

This was a prospective population-based study conducted in 739 (311 men and 428 women) healthy middle-aged (median age: 53.8 y) whites. The median follow-up was 5.6 y. PAEE (MJ/d) was assessed by heart rate monitoring, individually calibrated by using the FLEX heart rate method. Fat mass (FM) and fat-free mass (FFM) were assessed by bioimpedance.

RESULTS:

Body weight (BW) at follow-up was significantly related to baseline PAEE (P < 0.05) after adjustment for sex, baseline age, FM, FFM, and follow-up time. A significant interaction between PAEE and age (P = 0.023) was observed. After the subjects were stratified (above and below the median for age), BW increased by a mean (+/-SD) of 1.7 +/- 5.9 kg (P < 0.0001) in the younger cohort. In this group, follow-up FM was significantly associated with baseline PAEE (P = 0.036) after adjustment for confounders. In the older cohort, BW did not change between baseline and follow-up. In this group, in contrast with the younger population, follow-up BW, FM, and FFM were all significantly and positively associated with baseline PAEE (P < 0.01 for all).

CONCLUSIONS:

Baseline PAEE predicts a change in FM in younger adults, who as a group gained weight in this study. In contrast, baseline PAEE in older adults--who were on average weight stable--is associated with a gain in BW, which was explained by an increase in FM and FFM.

PMID:
15883416
[PubMed - indexed for MEDLINE]
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