Bolanowski M, Nilsson B E
Department of Endocrinology and Diabetology, Medical University, Wroclaw, Poland.
Med Sci Monit. 2001 Sep-Oct;7(5):1029-33.
Human body composition, particularly the content of fat tissue and its distribution, has been extensively measured in healthy, diseased, obese and elderly subjects. A variety of non-invasive methods have been applied for these studies. Bioelectrical impedance analysis (BIA) is a commonly used method, based on the conduction of electrical current in the body and the differences in the ability to conduct electricity between the fat and water components of the body. Recently, dual-energy x-ray absorptiometry (DEXA) has been introduced for bone mass, bone mineral density and body composition studies. Unlike other methods, DEXA measures three components of the body: bone mineral content, fat tissue mass, and lean tissue mass, and additionally regional fat distribution. The objective of this study was to compare body composition as assessed by DEXA and BIA methods in a sample of 100 patients.
Body composition was studied in 100 consecutive subjects, 59 women and 41 men. The lean body mass (LBM), fat body mass (FBM), and percent body fat (%BF) were measured by the DEXA and BIA techniques.
There were highly statistically significant linear relationships between LBM, FBM and %BF assessed by DEXA and BIA in both sexes (p<0.001 for all measurements). No influence of age or BMI on the relationship between DEXA and BIA results was observed. Differences were observed between DEXA and BIA measurements of both fat and fat-free tissue. The results suggest that DEXA may underestimate the LBM and overestimate body fat compared with BIA, probably due to different assumptions about the constants.
We conclude that both methods are suitable for body composition studies.
人体成分，尤其是脂肪组织的含量及其分布，已在健康、患病、肥胖和老年受试者中进行了广泛测量。多种非侵入性方法已应用于这些研究。生物电阻抗分析（BIA）是一种常用方法，基于电流在体内的传导以及身体脂肪和水分成分导电能力的差异。最近，双能X线吸收法（DEXA）已被引入用于骨量、骨矿物质密度和身体成分研究。与其他方法不同，DEXA可测量身体的三个成分：骨矿物质含量、脂肪组织量和瘦组织量，此外还可测量局部脂肪分布。本研究的目的是比较100例患者样本中通过DEXA和BIA方法评估的身体成分。
对100名连续受试者进行身体成分研究，其中女性59名，男性41名。通过DEXA和BIA技术测量瘦体重（LBM）、脂肪体重（FBM）和体脂百分比（%BF）。
DEXA和BIA评估的男女LBM、FBM和%BF之间均存在高度统计学意义的线性关系（所有测量p<0.001）。未观察到年龄或BMI对DEXA和BIA结果之间关系的影响。在脂肪和无脂肪组织的DEXA和BIA测量之间观察到差异。结果表明，与BIA相比，DEXA可能低估LBM并高估体脂，这可能是由于对常数的不同假设。
我们得出结论，两种方法都适用于身体成分研究。
