生物电阻抗法和双能X射线吸收法测定健康成人体成分的对比研究

Comparison Analysis on Bioelectrical Impedance with Dual-energy X-ray Absorption in Measuring Healthy Adult Body Composition

目的:比较生物电阻抗法与双能X射线吸收法测量健康成人体成分的一致性。方法:采用便携式生物电阻抗仪和双能X射线吸收仪同时测量48名健康受试者去脂体重、脂肪含量和体脂率,配对t检验比较两种方法测量健康成人去脂体重、脂肪含量和体脂率的差异,相关系数和Bland-Altman分析用于评价两种方法测量结果的相关性和一致性。结果:无论是总体还是男性和女性,生物电阻抗法与双能X射线吸收法的体成分测定值之间均呈现明显的正相关,除男性体脂含量(r=0.89)和体脂率(r=0.74)外,两种方法体成分测定值的相关系数r>0.90(P<0.05)。从总体看,与双能X射线吸收法相比,生物电阻抗法低估了身体脂肪含量[(-1.3±1.7)kg, 95%一致限:(-4.6~2.1)kg]和体脂率[(-3.0%±2.8%),95%一致限:(-8.4%~2.5%)],高估了去脂体重[(2.7±1.7)kg, 95%一致限:(-0.6~6.1)kg]。结论:生物电阻抗法在测量健康成人体成分中具有一定应用价值。同双能X射线吸收法相比,生物电阻抗法低估了体脂量和体脂率,需要进一步优化其体成分模型。

Objective To compare accuracy of bioelectrical impedance analysis(BIA)and dual-energy X-ray absorption(DXA)in measuring Chinese healthy adult body composition.Method Both portable BIA and DXA were used to measure the lean body mass,fat mass and body fat percentage of 48 healthy Chinese subjects at the same time.The paired t-test,correlation and Bland-Altman were used to compare the difference and to evaluate the correlation and accuracy of the measurement results of the two methods.Result Whether it’s overall or male and female,there was a significant positive correlation in body composition measurements between the two methods.All correlation coefficients were greater than 0.90(P<0.05),except for male body fat mass(r=0.89)and male body fat percentage(r=0.74).From a general perspective,compared with DXA,the BIA method underestimated body fat mass[(-1.3±1.7)kg,95%LOA(-4.6~2.1)kg]and body fat percentage[(-3.0%±2.8%),95%LOA(-8.4%~2.5%)],overestimated lean body mass[(2.7±1.7)kg,95%LOA(-0.6~6.1)kg].Conclusion The BIA could be used in measuring the body composition of healthy Chinese adults.Compared with DXA,the BIA underestimates body fat mass and body fat percentage,and the BIA body composition evaluation model needs to be further improved.