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首页> 外文期刊>Metabolism: Clinical and Experimental >Comparison of dual-energy X-ray absorptiometry to four other methods to determine body composition in underweight patients with chronic gastrointestinal disease.
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Comparison of dual-energy X-ray absorptiometry to four other methods to determine body composition in underweight patients with chronic gastrointestinal disease.

机译：比较双能量X射线吸收法与其他四种方法来确定体重不足的慢性胃肠道疾病患者的身体成分。

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摘要

Assessment of body composition may provide important information about the nutritional status. The applicability of two safe and convenient methods for body composition analysis, bioelectrical impedance analysis (BIA) and dual-energy x-ray absorptiometry (DXA), in underweight patients with chronic gastrointestinal disease has been sparsely elucidated. Our objective was to compare measurements by DXA with four other methods. Furthermore, we compared total body water (TBW) by BIA using three different BIA equations with measurement of TBW by tritium dilution (TBW-3H2O). Nineteen clinically stable underweight patients with chronic gastrointestinal disease were included in the study (body mass index [BMI], 19.3 +/- 1.2 kg/m2). Body composition was assessed using total body potassium (TBK), isotope dilution of tritium (3H2O), anthropometry (skinfold thickness [SF]), BIA, and DXA. Fat-free mass (FFM) by DXA was in reasonable agreement with body composition measurements by TBK (mean difference(TBK-DXA) = -1.61 kg, r = .88, standard error of the estimate [SEE] = 4.66 kg) and 3H2O (mean difference(3H2O-DXA) = 0.98 kg, r = .93, SEE = 3.34 kg). Although mean values for FFM by DXA differed significantly versus BIA and SF, we found highly significant correlations between the measurements (r = .97 and r = .97, respectively). The mean TBW by BIA was overestimated by 1.9 and 3.1 L compared with TBW-3H2O when prediction equations for normal-weight subjects were used. We conclude that the DXA method is a valuable addition to the list of methods available for body composition studies in clinically stable underweight patients. Our data show that BIA equations for normal-weight subjects overestimated TBW in the patients studied.
机译：身体成分的评估可能会提供有关营养状况的重要信息。体重不足的慢性胃肠病患者的两种安全，便捷的身体成分分析方法，生物电阻抗分析（BIA）和双能X线骨密度仪（DXA）的适用性已被稀疏阐明。我们的目标是将DXA与其他四种方法进行比较。此外，我们使用三种不同的BIA方程比较了BIA的人体总水（TBW）与by稀释（TBW-3H2O）的TBW测量。该研究包括19名临床稳定的体重过轻的慢性胃肠道疾病患者（体重指数[BMI]，19.3 +/- 1.2 kg / m2）。使用全身钾（TBK），is的同位素稀释（3H2O），人体测量法（皮褶厚度[SF]），BIA和DXA评估身体成分。 DXA的无脂肪质量（FFM）与TBK的身体成分测量值合理一致（平均差异（TBK-DXA）= -1.61 kg，r = 0.88，估计的标准误差[SEE] = 4.66 kg）， 3H2O（平均差异（3H2O-DXA）= 0.98 kg，r = .93，SEE = 3.34 kg）。尽管DXA对FFM的平均值与BIA和SF显着不同，但我们发现测量之间存在高度相关（分别为r = .97和r = .97）。当使用体重正常的受试者的预测方程时，与TBW-3H2O相比，BIA的平均TBW被高估了1.9和3.1L。我们得出结论，DXA方法是可用于临床稳定的体重过轻患者的身体成分研究的方法列表的重要补充。我们的数据表明，正常体重受试者的BIA方程高估了所研究患者的TBW。

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