Division of Nutrition and Metabolism, Universidade de São Paulo, Avenida Bandeirantes, 3900, 14049-900 - Ribeirão Preto - SP, Brasil.
J Nutr Health Aging. 2012 Feb;16(2):124-7. doi: 10.1007/s12603-011-0137-y.
There is no consensus regarding the accuracy of bioimpedance for the determination of body composition in older persons.
This study aimed to compare the assessment of lean body mass of healthy older volunteers obtained by the deuterium dilution method (reference) with those obtained by two frequently used bioelectrical impedance formulas and one formula specifically developed for a Latin-American population.
A cross-sectional study.
Twenty one volunteers were studied, 12 women, with mean age 72±6.7 years.
Urban community, Ribeirão Preto, Brazil.
Fat free mass was determined, simultaneously, by the deuterium dilution method and bioelectrical impedance; results were compared. In bioelectrical impedance, body composition was calculated by the formulas of Deuremberg, Lukaski and Bolonchuck and Valencia et al.
Lean body mass of the studied volunteers, as determined by bioelectrical impedance was 37.8±9.2 kg by the application of the Lukaski e Bolonchuk formula, 37.4±9.3 kg (Deuremberg) and 43.2±8.9 kg (Valencia et. al.). The results were significantly correlated to those obtained by the deuterium dilution method (41.6±9.3 Kg), with r=0.963, 0.932 and 0.971, respectively. Lean body mass obtained by the Valencia formula was the most accurate.
In this study, lean body mass of older persons obtained by the bioelectrical impedance method showed good correlation with the values obtained by the deuterium dilution method. The formula of Valencia et al., developed for a Latin-American population, showed the best accuracy.
目前对于生物阻抗法在老年人身体成分评估中的准确性尚无共识。
本研究旨在比较用氘稀释法（参考方法）和两种常用的生物电阻抗公式以及专门为拉丁美洲人群开发的公式评估健康老年志愿者的去脂体重。
横断面研究。
21 名志愿者参加了研究，其中 12 名为女性，平均年龄 72±6.7 岁。
巴西里贝朗普雷图市的城市社区。
同时用氘稀释法和生物电阻抗法测定去脂体重；并对结果进行比较。在生物电阻抗中，用 Deuremberg、Lukaski 和 Bolonchuck 以及 Valencia 等公式计算身体成分。
用 Lukaski 和 Bolonchuck 公式计算的研究志愿者的去脂体重为 37.8±9.2kg，用 Deuremberg 公式为 37.4±9.3kg（Deuremberg）和 43.2±8.9kg（Valencia 等）。结果与氘稀释法（41.6±9.3kg）高度相关，相关系数分别为 0.963、0.932 和 0.971。用 Valencia 公式得出的去脂体重最准确。
在本研究中，生物电阻抗法得出的老年人去脂体重与氘稀释法得出的值相关性良好。专为拉丁美洲人群开发的 Valencia 公式具有最佳的准确性。
