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- Title
DXA derived body composition measures are consistently associated with physical performance across 4 older populations.
- Authors
Kritchevsky, Stephen B.; Leng, Iris; Miller, Michael E.; Jingzhong Ding; Kitzman, Dalane; Berry, Michael; Houston, Denise; Lenchik, Leon
- Abstract
We examined the correlation between dual-energy x-ray absorptiometry (DXA) measures of body composition and physical performance across 4 studies to determine the strength and consistency of the associations. We included 644 participants (53.5% women) evaluated in one of 4 studies which included those with diastolic heart failure, chronic obstructive pulmonary disease, high cardiovascular disease risk, and high mobility disability risk. From DXA we calculated appendicular lean body mass (aLM) and percent body fat. Height and weight were used to calculate body mass index (kg/m²). Physical performance measures were grip strength, a physical performance battery (PPB) score, and 4 meter walk time. The mean age of the study populations ranged from 66-76 yrs. Results were consistent across studies. Partialing out age, race and study, aLM was correlated with grip-strength (r = 0.29 (p<.001) in women, 0.47 (p<.001) in men), but not PPB score or walking speed. Percent body fat was correlated PPB score (r = -0.13 (p=0.02), -0.14 (p=0.02)) in women and men, respectively. Percent body fat was also correlated with longer walking times in men (r = 0.13 (p=0.03)). BMI was not associated with any performance measure in either gender. These data show that DXA derived measures of body composition have a consistent association with physical performance in older populations with a variety of comorbidities.
- Subjects
ABSORPTION (Physiology); HUMAN body composition; PHYSICAL fitness; HEALTH of older people; CARDIOVASCULAR diseases; BODY mass index
- Publication
FASEB Journal, 2007, Vol 21, Issue 6, pA1068
- ISSN
0892-6638
- Publication type
Article
- DOI
10.1096/fasebj.21.6.a1068-a