Proportional bias between dual-energy x-ray absorptiometry and bioelectrical impedance analysis varies based on sex in active adults consuming high- and low-carbohydrate diets
Proportional bias between dual-energy x-ray absorptiometry and bioelectrical impedance analysis varies based on sex in active adults consuming high- and low-carbohydrate diets
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DOI：
10.1016/j.nutres.2017.05.003
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发表时间：
2017-06-01
影响因子：
4.5
通讯作者：
Tinsley, Grant M.
中科院分区：
文献类型：
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作者：
Tinsley, Grant M.
双能X射线吸收法(DXA)和生物电阻抗分析法(BIA)是常用的身体成分评估方法，但这两种方法之间的一致性各不相同。在6个不同的时间点，对48名食用标准高碳水化合物和低碳水化合物饮食的男性和女性的DXA和单频BIA之间的偏差进行了评估。假设DXA和BIA之间存在固定的和成比例的偏差，但偏差的程度不因性别而异。DXA和BIA获得的估计值存在显著的固定偏差，男性和女性对脂肪质量(FM)和脱脂质量(FFM)都表现出比例偏差。女性的偏倚程度更大，只有女性对体脂百分比表现出比例偏向。在FM较少的个体中，DXA和BIA之间的平均差异很大，表明BIA相对于DXA低估了FM。然而，在FM较大的个体中，人们看到了更好的一致性。相应地，FFM估计的平均差异在FFM较少的个体中更大。在一些相对于样本有大量FM或FFM的个体中，设备之间的关系被颠倒，以至于BIA高估了FM而低估了FFM。DXA和BIA之间的不一致程度因身体大小和性别而有很大差异，因此目前还不能就这些技术的可比性做出全面的声明。(C)2017 Elsevier Inc.保留所有权利。
Dual-energy x-ray absorptiometry (DXA) and bioelectrical impedance analysis (BIA) are common methods of body composition assessment, but the agreement between these methods varies. Bias between DXA and single-frequency BIA was evaluated at 6 different time points in 48 active male and female adults consuming standardized high- and low-carbohydrate diets. It was hypothesized that fixed and proportional biases exist between DXA and BIA but that the extent of bias does not differ based on sex. Substantial fixed bias was present for estimates obtained by DXA and BIA, and both men and women exhibited proportional bias for fat mass (FM) and fat-free mass (FFM). The magnitude of bias was greater in women, and only women exhibited proportional bias for body fat percentage. In individuals with less FM, the mean difference between DXA and BIA was high, indicating that BIA underestimated FM relative to DXA. However, in individuals with greater FM, better agreement was seen. Correspondingly, the mean difference in FFM estimates was greater in individuals with less FFM. In some individuals with high quantities of FM or FFM relative to the sample, the relationship between devices was reversed such that BIA overestimated FM and underestimated FFM. The degree of disagreement between DXA and BIA varies substantially based on body size and sex such that all-encompassing statements regarding the comparability of these technologies cannot presently be made. (C) 2017 Elsevier Inc. All rights reserved.