Johansson A G, Forslund A, Sjödin A, Mallmin H, Hambraeus L, Ljunghall S
Department of Internal Medicine, University of Uppsala, Sweden.
Am J Clin Nutr. 1993 Mar;57(3):323-6. doi: 10.1093/ajcn/57.3.323.
Determination of body composition by dual-energy x-ray absorptiometry (DEXA) was evaluated in healthy men, by using underwater weighing (UWW), skinfold thickness measurement, and bioimpedance analysis. There were strong correlations between percent body fat obtained by all techniques, but DEXA gave significantly lower values (P < 0.001). The influence of differences in bone mineral density (BMD) on fat content determined by UWW was also studied. The individual differences between UWW and DEXA fat estimates were calculated and there was a negative correlation with BMD (r = -0.50, P < 0.05). There was also a negative correlation between body fat by UWW and BMD (r = -0.71, P < 0.01) in the subjects with lowest fat by DEXA, indicating that high or low BMD gave false values by UWW. In conclusion, DEXA and UWW provide complementary information and a combination of these techniques seems to offer new opportunities in evaluations of body composition.
通过水下称重（UWW）、皮褶厚度测量和生物电阻抗分析，对健康男性采用双能X线吸收法（DEXA）测定身体成分进行了评估。所有技术所测得的体脂百分比之间存在很强的相关性，但DEXA得出的值显著更低（P < 0.001）。还研究了骨密度（BMD）差异对UWW测定的脂肪含量的影响。计算了UWW和DEXA脂肪估计值之间的个体差异，发现其与BMD呈负相关（r = -0.50，P < 0.05）。在DEXA测得脂肪含量最低的受试者中，UWW测得的体脂与BMD之间也存在负相关（r = -0.71，P < 0.01），这表明高或低的BMD会使UWW得出错误的值。总之，DEXA和UWW提供了互补信息，这些技术的结合似乎为身体成分评估提供了新的机会。
