Kuriyan Rebecca, Thomas Tinku, Ashok Sangeetha, Jayakumar J, Kurpad Anura V
Division of Nutrition, St. John's Research Institute, St. John's National Academy of Health Sciences, Bangalore, India.
Indian J Med Res. 2014 May;139(5):700-7.
BACKGROUND & OBJECTIVES: Many methods are available for measuring body fat of an individual, each having its own advantages and limitations. The primary objective of the present study was to validate body fat estimates from individual methods using the 4-compartment (4C) model as reference. The second objective was to obtain estimates of hydration of fat free mass (FFM) using the 4C model.
The body fat of 39 adults (19 men and 20 women) aged 20-40 yr was estimated using air displacement plethysmography (ADP), dual energy X-ray absorptiometry (DEXA), 4-skinfold technique and bio-electrical impedance (BIA). Total body water was estimated using isotope dilution method.
All the methods underestimated body fat when compared to 4C model, except for DEXA and the mean difference from the reference was lowest for DEXA and ADP. The precision of the fat mass estimated from 4C model using the propagation of error was 0.25 kg, while the mean hydration factor obtained by the 4C model was found to be 0.74 ± 0.02 in the whole group of men and women.
INTERPRETATIONS & CONCLUSION: The results of the present study suggest that DEXA and ADP methods can provide reasonably accurate estimates of body fat, while skinfold and bio-electrical impedance methods require the use of population specific equations.
测量个体体脂的方法众多，每种方法都有其自身的优缺点。本研究的主要目的是以四成分（4C）模型为参照，验证个体测量方法对体脂的估计。第二个目的是使用4C模型获得去脂体重（FFM）的水合估计值。
采用空气置换体积描记法（ADP）、双能X线吸收法（DEXA）、四点皮褶厚度技术和生物电阻抗法（BIA）对39名年龄在20至40岁的成年人（19名男性和20名女性）的体脂进行估计。采用同位素稀释法估计全身水含量。
与4C模型相比，所有方法均低估了体脂，DEXA除外，且DEXA和ADP与参照值的平均差异最小。利用误差传播从4C模型估计的脂肪量精度为0.25kg，在全体男性和女性中，4C模型得到的平均水合因子为0.74±0.02。
本研究结果表明，DEXA和ADP方法可提供较为准确的体脂估计值，而皮褶厚度法和生物电阻抗法需要使用特定人群的方程。
