[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 (> or = 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.


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.
Freitas Júnior
Ismael Forte
IF
Faculdade de Ciências e Tecnologia de Presidente Prudente, Universidade Estadual Paulista (UNESP), Presidente Prudente, Brasil.
Rupp de Paiva
Sérgio Alberto
SA
de Godoy
Irma
I
Smaili Santos
Suhaila Mahmoud
SM
Campana
Alvaro Oscar
AO
D015502:Absorptiometry, Photon / Q000379:methods*; D000273:Adipose Tissue / Q000033:anatomy & histology*; D000368:Aged; D000704:Analysis of Variance; D000886:Anthropometry / Q000379:methods*; D001823:Body Composition; D015992:Body Mass Index; D016022:Case-Control Studies; D017097:Electric Impedance; D006801:Humans; D008297:Male; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive; D015203:Reproducibility of Results