Bioelectrical impedance with different equations versus deuterium oxide dilution method for the inference of body composition in healthy older persons

Abstract

Abstract:Background: There is no consensus regarding the accuracy of bioimpedance for the determination of body composition in older persons. Objective: 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. Design: A cross-sectional study. Participants: Twenty one volunteers were studied, 12 women, with mean age 72±6.7 years. Setting: Urban community, Ribeirão Preto, Brazil. Measurement: 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. Results: 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. Conclusion: 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.

Comparison of body composition analysis methods among centenary women: Seeking simpler methods

“…In addition, it is minimally invasive and can be used in any clinical situation. 6 Dual X-ray absorptiometry (DXA) assessment is considered to be a reference method for the evaluation of body composition. 7 However, it is often difficult to take centenarians to the reference center for the realization of the DXA, due to difficulties of locomotion.…”

Estudo da composição corporal de idosas ativas pelos métodos óxido de deutério e antropométrico

“…Some more sophisticated methods for assessment of body composition, such as the double X-ray absorptiometry 18 and the deuterium oxide 7 , are often not feasible for use in field studies due to their high costs and the need of specialized personnel for their analysis. Anthropometry is still the most widely used method, due to the low costs and simplicity.…”

Composição corporal de jovens e idosas eutróficas e com sobrepeso avaliada pelo método óxido de deutério e diferentes equações antropométricas

“…Para isso, é importante adotar técnicas que sejam precisas para a avaliação da composição corporal, como é o caso do óxido de deutério ( 2 H 2 O) [6][7][8] . Apesar de ser muito acurada, o óxido de deutério ainda é pouco utilizado na prática clínica e apresenta custos elevados e métodos sofisticados de análise, como o espectrômetro de massa.…”

“…Alguns mé-todos mais sofisticados para estimar a composição corporal 7,26 , a exemplo da absorciometria por dupla emissão de raios X e do óxido de deutério, muitas vezes são inviáveis para estudo de campo devido ao seu alto custo e da necessidade de pessoas especializadas para sua análise 8 . O método antropométrico ainda é o mais usado pela sua facilidade e economia.…”