Department of Medicine, Division of Endocrinology, Centre de recherche clinique Etienne-Le Bel, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Canada.
Metab Syndr Relat Disord. 2010 Oct;8(5):437-41. doi: 10.1089/met.2010.0013.
Several techniques are currently used for measurement of body composition. Bioelectrical impedance assessment (BIA) is a simple, noninvasive method of assessing body composition. We aimed to compare multifrequency hand-to-foot (HF-BIA) and foot-to-foot (FF-BIA) bioelectrical impedance analysis techniques to assess fat-free mass (FFM) in a population with a wide range of body mass indices (BMI).
This was a cross-sectional study of 198 adult subjects. Anthropometric and BIA measures (HF-BIA with Hydra ICF/ECF, Xitron Technologies and FF-BIA with Tanita, model TBF-300A) were recorded after a 12-h fast.
Participants had a mean age of 42 years and BMI of 33.50.7 (range, 17.7-65.6) kg/m2. Mean FFM with HF-BIA (FFM BIA/HF) and FF-BIA (FFM BIA/FF) were 61.31.3 kg and 58.10.9 kg, respectively (P < 0.001). In subjects with BMI <25 kg/m2, FFM BIA/FF was not significantly different compared to FFMBIA/HF (-0.2 kg; P=0.8). However, FFM BIA/FF was significantly lower in subjects with BMI 25-30 kg/m2 (-2.0 kg; P=0.009), 30-34 kg/m2 (-1.8 kg; P¼0.04), 34-42 kg/m2 (-4.7 kg; P<0.001) and >42 kg/m2 (-8.0 kg; P=0.001). Pearson correlations between both methods were very high for FFM (r=0.92), fat mass (r=0.91), and % fat mass (r=0.85), all P<0.001. Correlation coefficients for FFM were high in each quintile of BMI. FFM BIA/FF was the only significant independent predictor of FFM BIA/HF (P<0.001) in linear regression analyses using clinical and FF-BIA variables, but introducing BMI in the model added precision.
FFM BIA/FF correlates closely with FFM BIA/HF across all quintiles of BMI, but FF-BIA gives lower FFM in overweight and obese subjects.
目前有几种技术可用于测量人体成分。生物电阻抗评估（BIA）是一种简单、非侵入性的方法，可用于评估人体成分。我们的目的是比较多频手到脚（HF-BIA）和脚到脚（FF-BIA）生物电阻抗分析技术，以评估体重指数（BMI）范围广泛的人群中的去脂体重（FFM）。
这是一项横断面研究，共纳入 198 名成年受试者。在禁食 12 小时后，记录人体测量学和 BIA 测量值（HF-BIA 使用 Hydra ICF/ECF，Xitron Technologies 和 FF-BIA 使用 Tanita，型号 TBF-300A）。
参与者的平均年龄为 42 岁，BMI 为 33.50.7（范围为 17.7-65.6）kg/m2。HF-BIA（FFM BIA/HF）和 FF-BIA（FFM BIA/FF）的平均 FFM 分别为 61.31.3kg 和 58.10.9kg（P<0.001）。在 BMI<25kg/m2 的受试者中，FFM BIA/FF 与 FFM BIA/HF 无显著差异（-0.2kg；P=0.8）。然而，在 BMI 为 25-30kg/m2（-2.0kg；P=0.009）、30-34kg/m2（-1.8kg；P=0.04）、34-42kg/m2（-4.7kg；P<0.001）和>42kg/m2（-8.0kg；P=0.001）的受试者中，FFM BIA/FF 明显更低。两种方法之间的 FFM（r=0.92）、脂肪量（r=0.91）和%脂肪量（r=0.85）的相关性均非常高，所有 P<0.001。在 BMI 的每个五分位中，FFM 的相关系数均较高。在使用临床和 FF-BIA 变量的线性回归分析中，FFM BIA/FF 是 FFM BIA/HF 的唯一显著独立预测因子（P<0.001），但在模型中引入 BMI 可提高精度。
FFM BIA/FF 与 BMI 所有五分位的 FFM BIA/HF 密切相关，但 FF-BIA 在超重和肥胖受试者中给出的 FFM 较低。
