Svendsen O L, Haarbo J, Hassager C, Christiansen C
Department of Clinical Chemistry, Glostrup Hospital, University of Copenhagen, Denmark.
Am J Clin Nutr. 1993 May;57(5):605-8. doi: 10.1093/ajcn/57.5.605.
The accuracy of body-composition measurements in vivo by dual-energy x-ray absorptiometry (DEXA) was assessed in seven pigs (weight: 35-95 kg) by measurement by DEXA in vivo and chemical analysis after postmortem homogenization. The regression lines between these measurements were not significantly different from the line of identity (P > 0.05), the r values were > 0.97, and the corresponding SEEs were 2.9%, 1.9 kg, and 2.7 kg for percent fat, fat tissue mass, and lean body mass, respectively. Changes in fat and lean tissue mass (simulated by placing 8.8 kg porcine lard on the trunk of six women) were accurately measured by DEXA. The measured total-body bone mineral (TBBM) was significantly affected by the lard (P < 0.05). In conclusion, DEXA is an accurate method for measurement of soft-tissue body composition. TBBM measurements in longitudinal studies may, however, be difficult to interpret if considerable change in soft-tissue composition has occurred.
通过对7头猪（体重35 - 95千克）进行体内双能X线吸收法（DEXA）测量以及死后均质化后的化学分析，评估了DEXA在体内进行身体成分测量的准确性。这些测量之间的回归线与恒等线无显著差异（P > 0.05），r值> 0.97，脂肪百分比、脂肪组织质量和瘦体重的相应标准误分别为2.9%、1.9千克和2.7千克。DEXA能准确测量脂肪和瘦组织质量的变化（通过在6名女性躯干上放置8.8千克猪脂肪模拟）。猪油显著影响了测量的全身骨矿物质（TBBM）（P < 0.05）。总之，DEXA是测量软组织身体成分的准确方法。然而，如果软组织成分发生了相当大的变化，纵向研究中的TBBM测量结果可能难以解释。
