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首页> 外文期刊>Clinical nutrition >Comparison of body weight and composition measured by two different dual energy X-ray absorptiometry devices and three acquisition modes in obese women.
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Comparison of body weight and composition measured by two different dual energy X-ray absorptiometry devices and three acquisition modes in obese women.

机译：在肥胖女性中，通过两种不同的双能X线骨密度仪和三种采集方式测量的体重和成分的比较。

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BACKGROUND & AIMS: Weight measured by dual-energy X-ray (DXA) was shown to be increasingly underestimated in subjects over 75kg compared to an electronic scale. This study compares body weight and composition measured by balance beam scale and three DXA acquisition modes in obese subjects. METHODS: In 39 obese, body weight was measured by balance beam scale, and body weight and composition by DXA Hologic QDR4500A((R)) in normal (NPM) and high power mode (HPM) (Enhanced v8.26 and v8.26* softwares) and DXA GE-Lunar Prodigy((R)) (v6.5 software). To ensure linearity of body weight and composition measured by the different DXA acquisitions, we also measured 13 women with a body mass index (BMI) of 25-30kg/m(2). RESULTS: While QDR4500A HPM overestimates scale weight by about 2kg over the whole BMI spectrum, QDR4500A NPM underestimates scale weight as a weight-dependent response (-1.7+/-1.8kg overall, -4.1+/-1.6kg in morbidly obese women). These results suggest switching from one mode to the other at a specific threshold, i.e. in our study a weight of 90kg or a BMI of 34kg/m(2). Prodigy gives weight about similar to scale (+0.5+/-0.8kg). Both Hologic acquisition modes underestimate fat mass but overestimate lean body mass compared to Prodigy. CONCLUSIONS: The QDR4500A NPM is inappropriate in women over 90kg. Unfortunately, the QDR4500A HPM overestimates body weight in the range of 90-150kg. The difference between scale and Prodigy weight remains stable throughout weight ranges. To better assess their accuracies in terms of body composition, QDR4500A NPM, HPM and Prodigy should be tested against phantoms or in vivo multi-compartment models.
机译：背景与目的：与电子秤相比，在75公斤以上的受试者中，通过双能X射线（DXA）测量的体重被越来越低估。这项研究比较了肥胖受试者中通过平衡木秤和三种DXA采集模式测量的体重和成分。方法：在39个肥胖者中，通过平衡木秤测量体重，并通过DXA Hologic QDR4500A（R）在正常（NPM）和高功率模式（HPM）下测量体重和组成（增强的v8.26和v8.26 *软件）和DXA GE-Lunar Prodigy（R）（v6.5软件）。为了确保通过不同的DXA采集所测得的体重和组成的线性关系，我们还测量了13名体重指数（BMI）为25-30kg / m的女性（2）。结果：尽管QDR4500A HPM在整个BMI频谱中高估了秤重约2kg，但QDR4500A NPM却低估了秤重作为体重依赖性的反应（总体为-1.7 +/- 1.8kg，病态肥胖女性为-4.1 +/- 1.6kg） 。这些结果表明在特定的阈值即从90kg的体重或34kg / m的BMI可以从一种模式切换到另一种模式（2）。神童的体重大约相当于体重秤（+0.5 +/- 0.8kg）。与Prodigy相比，两种Hologic采集模式均低估了脂肪质量，但高估了瘦体重。结论：QDR4500A NPM不适合90公斤以上的女性。不幸的是，QDR4500A HPM高估了90-150kg的体重。体重和天才体重之间的差异在整个体重范围内保持稳定。为了更好地评估他们在身体组成方面的准确性，应针对人体模型或体内多隔室模型测试QDR4500A NPM，HPM和Prodigy。

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