Department of Nutrition, Dietetics and Food, Monash University, Notting Hill, VIC 3168, Australia.
School of Psychological Sciences, Monash University, Clayton, VIC 3168, Australia.
Nutrients. 2018 Oct 10;10(10):1469. doi: 10.3390/nu10101469.
This study aimed to compare the use of the bioelectrical impedance device (BIA) seca mBCA 515 using dual X-ray absorptiometry (DXA) as a reference method, for body composition assessment in adults across the spectrum of body mass indices. It explores the utility of simple anthropometric measures (the waist height ratio (WHtR) and waist circumference (WC)) for the assessment of obesity. In the morning after an overnight fast (10 h), 30 participants underwent a body composition DXA (GE iDXA) scan, BIA (seca 515), and anthropometric measures. Compared to the DXA reference measure, the BIA underestimated fat mass (FM) by 0.32 kg (limits of agreement -3.8 kg, 4.4 kg); overestimated fat free mass (FFM) by 0.43 kg (limits of agreement -8.2 kg, 4.3 kg). Some of the variation was explained by body mass index (BMI), as for FM, the mean difference of the normal range BMI group was smaller than for the overweight/obese group (0.25 kg and 0.35 kg, respectively) with wider limits of agreement (-4.30 kg, 4.81 kg, and -3.61 kg, 4.30 kg, respectively). There were significant differences in visceral adipose tissue (VAT) volume measurements between methods with BIA systematically overestimating VAT compared to DXA. WC was more strongly correlated with DXA FM (rho = 0.90, < 0.001) than WHtR (rho = 0.83, < 0.001). BIA had some agreement with DXA; however, they are not equivalent measures for the range of BMIs explored, with DXA remaining the more informative tool. WC is a useful and simple assessment tool for obesity.
本研究旨在比较生物电阻抗设备（BIA）seca mBCA 515 与双能 X 射线吸收法（DXA）作为参考方法在不同体质量指数范围内评估成人身体成分的应用。它探讨了简单人体测量学指标（腰高比（WHtR）和腰围（WC））在肥胖评估中的效用。在禁食 10 小时后的早晨，30 名参与者接受了身体成分 DXA（GE iDXA）扫描、BIA（seca 515）和人体测量学测量。与 DXA 参考测量相比，BIA 低估了脂肪量（FM）0.32kg（一致性范围-3.8kg，4.4kg）；高估了去脂体重（FFM）0.43kg（一致性范围-8.2kg，4.3kg）。部分变异可以用体重指数（BMI）来解释，因为对于 FM，正常范围 BMI 组的平均差值小于超重/肥胖组（分别为 0.25kg 和 0.35kg），一致性范围更宽（分别为-4.30kg，4.81kg，和-3.61kg，4.30kg）。两种方法测量内脏脂肪组织（VAT）体积存在显著差异，BIA 系统高估了 VAT。WC 与 DXA FM 的相关性更强（rho=0.90，<0.001），而 WHtR 与 DXA FM 的相关性较弱（rho=0.83，<0.001）。BIA 与 DXA 有一定的一致性；然而，它们不是所探索 BMI 范围内的等效测量方法，DXA 仍然是更具信息量的工具。WC 是一种有用且简单的肥胖评估工具。
