ASSESSMENT OF THE COMPOSITION OF MAJOR BODY REGIONS BY DUAL-ENERGY X-RAY ABSORPTIOMETRY (DEXA), WITH SPECIAL REFERENCE TO LIMB MUSCLE MASS
ASSESSMENT OF THE COMPOSITION OF MAJOR BODY REGIONS BY DUAL-ENERGY X-RAY ABSORPTIOMETRY (DEXA), WITH SPECIAL REFERENCE TO LIMB MUSCLE MASS
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DOI：
10.1111/j.1475-097x.1992.tb00831.x
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发表时间：
1992-05-01
期刊：
影响因子：
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通讯作者：
ELIA, M
中科院分区：
文献类型：
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作者：
FULLER, NJ;LASKEY, MA;ELIA, M
采用双能x线吸收仪（DEXA）对12名健康女性（体重，56.9 +/- 6.2 kg； BMI, 17-25 kg M-2）和16名健康男性（体重，73.1 +/- 9.6 kg； BMI, 20-28 kg M-2）进行了全身和主要身体部位的组成评估和比较。重复测量脂肪之间差异的标准偏差（和变异系数%）范围从手臂的0.11 kg（9.0%）到全身的0.42 kg (3.0%)；臂骨矿物质为0.01 kg(2.0%)，全身无脂软组织为0.42 kg（0.8%）。肢体肌肉质量采用一种新的身体组成理论模型进行估算，手臂和肢体总肌肉质量的估算精度分别为0.15 kg（3.8%）至0.27 kg（1.5%）。由脂肪组成的各个区域的比例，女性比男性大（范围分别为20-31%对16-18%），但躯干与腿部脂肪的比例较低（分别为34:49%对46:38%）。骨骼的区域比例在两性之间相似（女性和男性都在2.9-5.6%的范围内）。女性平均肢体总肌肉质量为14.2 kg（手臂，2-8 kg；腿，11-4 kg），男性平均肢体总肌肉质量为22.2 kg（手臂，4.8 kg；腿，17.4 kg），分别占无脂质量的33.6%和36.0%。肢体肌肉（DEXA）与其他肌肉质量指标的相关系数为：DEXA与全身钾的相关系数为0.90 （SEE 1.1 kg肌肉质量）~ 0-94 （1.6 kg肌肉质量）；DEXA与人体测量的比值为0-43 （1-2 kg）至0.85 （1-3 kg）。肢体体积（DEXA）与人体测量体积的比值为0.91（0.78 1）至0.94（1.91 1）。结果表明，DEXA能够有效且可重复地估计脂肪、无脂肪软组织、骨骼和肢体肌肉质量。
Dual-energy X-ray absorptiometry (DEXA) has been used to assess and compare the composition of whole body and major body regions in 12 female (weight, 56.9 +/- 6.2 kg; BMI, 17-25 kg M-2 ) and 16 male (weight, 73.1 +/- 9.6 kg; BMI, 20-28 kg m-2 ) healthy subjects. Standard deviations (and % coefficients of variation) of the differences between repeated measurements of fat ranged from 0.11 kg (9.0%) for arms to 0.42 kg (3.0%) for whole body; for arm bone mineral, 0.01 kg (2.0%), and for fat-free soft tissue of the whole body, 0.42 kg (0.8%). Limb muscle mass was estimated using a new theoretical model of body composition, and the corresponding precision ranged from 0.15 kg (3.8%) to 0.27 kg (1.5%) for arms and total limb muscle mass, respectively.Proportions of each region consisting of fat were greater in females than in males (range, 20-31% vs. 16-18%), respectively, but the ratio of trunk to leg fat was lower (34:49% vs. 46:38%, respectively). Regional proportions of bone were similar between the sexes (all in the range 2.9-5.6%, for both females and males).Mean total limb muscle masses were 14.2 kg (arms, 2-8 kg; legs, 11-4 kg) for females and 22.2 kg (arms, 4.8 kg; legs, 17.4 kg) for males, which were 33.6% and 36.0% of fat-free mass, respectively. The correlation coefficients between limb muscle (DEXA) and other indices of muscle mass were: for DEXA vs. total body potassium, 0.90 (SEE 1.1 kg muscle mass) to 0-94 (1.6 kg); and for DEXA vs. anthropometry, 0-43 (1-2 kg) to 0.85 (1-3 kg). Those for limb volume (DEXA) vs. anthropometric volume, 0.91 (0.78 1) to 0.94 (1.91 1).It is concluded that DEXA enables the valid and reproducible estimation of fat, fat-free soft tissue, bone, and limb muscle mass.