Análise comparativa de métodos de avalia？？o da composi？？o corporal em homens sadios e em pacientes com doen？a pulmonar obstrutiva cr？nica: antropometria, impedancia bioelétrica e absortiometria de raios-X de dupla energia

comparative analysis of body composition assessment methods in healthy men and in chronic obstructive pulmonary disease patients: anthropometry, bioelectrical impedance and dual-energy x-ray absorptiometry. the aim of this study was to examine the agreement between the results of body fat (bf and bf%), fat-free mass (ffm) and ffm index (ffmi= ffm/height2) as estimated by skinfold anthropometry (ant), bioelectrical impedance (bia) and dual-energy x-ray absorptiometry (dxa) in two groups of men (3 50 y), one comprising healthy individuals (n=23) and the other, patients with chronic obstructive pulmonary disease (copd) (n=24). comparisons between body composition techniques were done by repeated measures anova; the bland & altman procedure was used to analyse agreement. results and conclusions: 1) comparison between healthy and copd groups showed significant differences between all studied variables; 2) in the healthy group, values for bf, bf% , ffm and ffmi were not significantly different when bia or ant was compared to dxa; however, in copd, values for bf and bf% were significantly higher and for ffm and ffmi significantly lower when bia was compared to dxa; in contrast, no differences were shown between values for these variables when ant was compared with dxa; 3) bland & altman test, in both groups, showed no agreement between bia and dxa and between ant and dxa; it was also shown that body fat was overestimated and fat free mass underestimated by bia in relation to dxa.