Abstract
The objectives of the present study were to describe and compare the body composition variables determined by bioelectrical impedance (BIA) and the deuterium dilution method (DDM), to identify possible correlations and agreement between the two methods, and to construct a linear regression model including anthropometric measures. Obese adolescents were evaluated by anthropometric measures, and body composition was assessed by BIA and DDM. Forty obese adolescents were included in the study. Comparison of the mean values for the following variables: fat body mass (FM; kg), fat-free mass (FFM; kg), and total body water (TBW; %) determined by DDM and by BIA revealed significant differences. BIA overestimated FFM and TBW and underestimated FM. When compared with data provided by DDM, the BIA data presented a significant correlation with FFM (r = 0.89; P < 0.001), FM (r = 0.93; P < 0.001) and TBW (r = 0.62; P < 0.001). The Bland-Altman plot showed no agreement for FFM, FM or TBW between data provided by BIA and DDM. The linear regression models proposed in our study with respect to FFM, FM, and TBW were well adjusted. FFM obtained by DDM = 0.842 x FFM obtained by BIA. FM obtained by DDM = 0.855 x FM obtained by BIA + 0.152 x weight (kg). TBW obtained by DDM = 0.813 x TBW obtained by BIA. The body composition results of obese adolescents determined by DDM can be predicted by using the measures provided by BIA through a regression equation.
Highlights
Obesity in children and adolescents has become an increasing clinical and public health concern [1]
fat-free mass (FFM) values measured by deuterium dilution method (DDM) plotted against those measured by bioelectrical impedance (BIA) are shown in Figure 1A, with significant correlations between the two methods (r = 0.89; P < 0.001)
BIA overestimated FFM (118.5%) and total body water (TBW) (122.9%) and underestimated fat body mass (FM) (78.8%) compared to DDM; significant differences were observed in mean FM, FFM, and TBW determined by DDM and BIA
Summary
Obesity in children and adolescents has become an increasing clinical and public health concern [1]. It is evident from recent studies that the use of BIA for the assessment of body composition in children requires specific prediction formulas differing from those established for adults [12,13,14]. Such formulas have been developed for the prediction of FFM [15,16,17,18,19] and of TBW [12,13,14] in children. BIA could be an applicable method for the assessment of body composition in obese children, but until now it has not been validated for this population
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