Issn Print: 0195-9131

Publication Date: 2001/05/01


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BODY COMPOSITION IN BRAZILIAN GIRLS: THE BIOELECTRICAL IMPEDANCE METHOD

M M. Bottaro; C E. Paiva

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Author Information: Catholic University of Brasilia, Brasilia, DF:

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Excerpt

Recently Jenkins & Heyward (1999) developed a bioimpedance (BI) equation using a multi-ethnic group of hispanic and white children, aged 10 to 18 yrs (n = 120). Thus, this study was conducted to assess the predictive accuracy of BI equations for estimation of body composition of 31 Brazilian girls (10 to 14 yrs). A dual-energy x-ray absorptiometry (DXA, DPX-IQ, Version 4.6 A) was used to obtain reference measures of relative body fat (%BF) and fat-free mass (FFM). Total-body resistance was measured with a Biodynamics ® (Model-310) analyzer. The BI equations of Houtkooper et al. (1992), and Jenkins & Heyward (1999) were cross-validated. The results were as follows:
The Jenkins equation accurately estimated average FFM with an acceptable prediction error (SEE = 1.69 kg), and the line of best fit did not differ significantly (p > 0.05) from the line of identity. In addition, the Jenkins equation accurately estimated the FFM of approximately 87% of the individuals in this sample within ± 2.8kg. Although the Houtkooper equation had an acceptable prediction error (SEE = 1.77 kg), the equation overstimated average FFM by 1.15 kg (p < 0.05). Based on these results, we recommend using the Jenkins & Heyward (1999) BI equation for children to estimate body composition of healthy Brazilian girls (10 to 14 yrs).
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