Valero M A, León-Sanz M, Gómez I, Martínez G, Hawkins F
S. Endocrinología y Nutrición, Hospital 12 de Octubre, Madrid, España.
Nutr Hosp. 1994 Jan-Feb;9(1):12-7.
Dual-energy X ray absorptiometry (DEXA) is primarily used in the assessment of bone mineral. However, the transmissions of the two different energy beams in nonbone areas can be processed to calculate the amount of fat and free-fat mass of the soft tissues. We have compared the estimation of body fat mass (FM) by DEXA with data derived from anthropometric (A) (During & Womersley formula) and impedance (BIA) measurements. We have studied 10 subjects, 8 female and 2 male, age 39 +/- 17, weight 97.4 +/- 17.2 kg. The results were: FM 44.4 +/- 8.5 kg (DEXA), 40.6 +/- 6.3 kg (A) and 38.4 +/- 9.8 kg (BIA); FFM 52.1 +/- 14.1 kg (DEXA), 56.8 +/- 13.9 kg (A) and 58.8 +/- 13.6 kg (BIA). The correlation was higher between DEXA and A (r = 0.88, for women r = 0.94). BIA results change depending on the equation used to derive Lean Body Mass (LBM) according to different authors. DEXA measurements are independent from the explorer, whereas A and BIA determinations can change in separate occasions with the same or different observer. Therefore, DEXA method seems more reliable than BIA for the assessment of FM. If DEXA technology is not available, our results support the use of anthropometric over impedance measurements.
双能X线吸收法（DEXA）主要用于评估骨矿物质。然而，非骨区域中两种不同能量束的透射情况可用于计算软组织中的脂肪量和去脂体重。我们已将DEXA对体脂量（FM）的估计与来自人体测量学（A）（杜林&沃默斯利公式）和阻抗（BIA）测量的数据进行了比较。我们研究了10名受试者，8名女性和2名男性，年龄39±17岁，体重97.4±17.2千克。结果如下：FM为44.4±8.5千克（DEXA）、40.6±6.3千克（A）和38.4±9.8千克（BIA）；去脂体重为52.1±14.1千克（DEXA）、56.8±13.9千克（A）和58.8±13.6千克（BIA）。DEXA与A之间的相关性更高（r = 0.88，女性中r = 0.94）。根据不同作者用于推导瘦体重（LBM）的公式，BIA结果会有所变化。DEXA测量与检测者无关，而A和BIA测定在相同或不同观察者的不同情况下可能会发生变化。因此，对于FM的评估，DEXA方法似乎比BIA更可靠。如果没有DEXA技术，我们的结果支持使用人体测量学方法而非阻抗测量法。
