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1Department of Exercise Science, University of Georgia, Athens, Georgia 30602, 2Department of Health, Nutrition, and Exercise Sciences, University of Delaware, Newark, Delaware 19716; 3Department of Physiology, Michigan State University, East Lansing, Michigan 48824; and 4Shepherd Center, Atlanta, Georgia 30309
Submitted 28 February 2003 ; accepted in final form 24 September 2003
The purpose of this study was to determine whether the proportion of skeletal muscle in the fat-free soft tissue mass (FFST) is the same in men with spinal cord injury (SCI) and able-bodied controls. Skeletal muscle mass and FFST of the midthigh were determined by using magnetic resonance imaging and dual-energy X-ray absorptiometry, respectively, in men with long-term (>2 yr) complete SCI (n = 8) and able-bodied controls of similar age, height, and weight (n = 8). Muscle mass (1.36 ± 0.77 vs. 2.44 ± 0.47 kg) and FFST (1.70 ± 0.94 vs. 2.73 ± 0.80 kg) were lower in the SCI group than in the controls (P < 0.05), but the lower ratio of muscle to FFST in the SCI group (0.80 ± 0.09 vs. 0.91 ± 0.10, P < 0.05) suggested that they had a lower proportion of muscle in the FFST than in controls. This notion was supported by analysis of covariance, in that the mean muscle adjusted to the mean FFST of the groups combined was lower in the SCI group. Despite the lower proportion of muscle in the FFST of the SCI group, the relation between muscle and FFST was strong in the SCI group (r = 0.99) and controls (r = 0.96). The findings suggest a disproportionate loss of muscle in the paralyzed thighs after SCI relative to other nonfat constituents, which may be accurately estimated in men with long-term SCI by dual-energy X-ray absorptiometry if the lower proportion of muscle in the FFST (
15%) is taken into account.
disuse; atrophy; body composition; fat-free soft tissue
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