College of Nursing and Health Sciences, Texas A&M International University, Laredo, TX, USA.
Department of Exercise Science and Sport Management, Kennesaw State University, Kennesaw, GA, USA.
J Clin Densitom. 2020 Jan-Mar;23(1):138-148. doi: 10.1016/j.jocd.2019.04.005. Epub 2019 Apr 27.
This study examined the agreement between 2 segmental bioimpedance analysis (BIA) devices, air displacement plethysmography (BOD POD), and dual energy X-ray absorptiometry (DXA) for estimating body composition in obese adults. Fifty obese adults (25 men and 25 women; age = 34.20 ± 11.19 years; BMI = 36.14 ± 5.33 kg/m) had their body fat percentage (BF%) and fat-free mass (FFM) evaluated with 2 segmental BIA devices (InBody 230 and InBody 720), BOD POD, and DXA (Lunar iDXA). Body composition via the BOD POD was determined using the Siri equation whereas manufacturer-based equations generated metrics (ie, BF% and FFM) for the InBody devices. The effect size of the mean differences for all BF% and FFM comparisons were trivial (Cohen's d < 0.20). The standard error of estimate (SEE), total error (TE), and 95% limits of agreement (LOAs) were low for both segmental BIA devices when compared to DXA (SEE < 2.26% and 2.35 kg; TE < 2.58% and 2.66 kg; 95% LOAs < ± 4.94% and 4.86kg). The error for BOD POD was also low when compared to DXA (SEE = 2.39% and 2.57 kg; TE = 2.34% and 2.56 kg; 95% LOAs = 4.63% and 5.06 kg). Validity statistics were slightly higher, but considered acceptable, when comparing the segmental BIA devices against BOD POD (SEE < 3.37% and 3.63 kg; TE < 3.44% and 3.79 kg; 95% LOAs < ± 6.62% and 7.19 kg). Lastly, the 2 segmental BIA devices produced nearly identical validity statistics when compared to each other. However, both BIA devices revealed proportional bias for BF% and FFM when compared to the BOD POD and DXA (all p < 0.05). The current study's findings indicate the InBody 230 is interchangeable with the InBody 720 in obese adults. Also, the trivial effect size, when compared against the BOD POD and DXA, suggest the InBody devices could be used for estimating group BF% and FFM. In contrast, the significant proportional bias demonstrates the BIA devices are not acceptable for individual estimates of body composition in an obese clinical population.
这项研究旨在探讨两种节段性生物阻抗分析（BIA）设备、空气置换体描记法（BOD POD）和双能 X 射线吸收法（DXA）在肥胖成年人身体成分估计中的一致性。50 名肥胖成年人（25 名男性和 25 名女性；年龄=34.20±11.19 岁；BMI=36.14±5.33kg/m）使用两种节段性 BIA 设备（InBody 230 和 InBody 720）、BOD POD 和 DXA（Lunar iDXA）评估其体脂肪百分比（BF%）和去脂体重（FFM）。BOD POD 中的身体成分使用 Siri 方程确定，而制造商的方程则生成节段性 BIA 设备的指标（即 BF%和 FFM）。所有 BF%和 FFM 比较的均数差异的效应大小均较小（Cohen's d < 0.20）。与 DXA 相比，两种节段性 BIA 设备的估计标准差（SEE）、总误差（TE）和 95%一致性界限（LOA）均较低（SEE<2.26%和 2.35kg；TE<2.58%和 2.66kg；95%LOA<±4.94%和 4.86kg）。与 DXA 相比，BOD POD 的误差也较低（SEE=2.39%和 2.57kg；TE=2.34%和 2.56kg；95%LOA=4.63%和 5.06kg）。当将节段性 BIA 设备与 BOD POD 进行比较时，有效性统计数据略高，但仍可接受（SEE<3.37%和 3.63kg；TE<3.44%和 3.79kg；95%LOA<±6.62%和 7.19kg）。最后，当将两种节段性 BIA 设备相互比较时，它们产生了几乎相同的有效性统计数据。然而，与 BOD POD 和 DXA 相比，两种 BIA 设备均显示 BF%和 FFM 的比例偏差（均 p<0.05）。本研究结果表明，InBody 230 可与肥胖成年人的 InBody 720 互换使用。此外，与 BOD POD 和 DXA 相比，较小的效应大小表明，InBody 设备可用于估计 BF%和 FFM 的组群值。相反，显著的比例偏差表明，在肥胖的临床人群中，BIA 设备不能用于个体身体成分的估计。
