Comparation of specific equation of fat percentage in Brazilian military women with bioimpedance and infrared interactance methods

Abstract In Brazil, the beginning of the 21st century has seen the expansion of work groups that focus their academic and professional activities on the analysis of body composition. This study aimed to: Compare the values estimated by the specific equation developed, with the values obtained by the methods of Bioimpedance - BIA (tetrapolar MALTRON 900), Infrared Interactance - NIR (FUTREX 5000 A/ZL) and Hydrostatic Weighing (like Gold Stand). Study is characterized as correlational descriptive research. In the sample, 16 women were used, with an average age of 31.6 (± 6.4), weight (MCT) of 59.6 (± 7.8), height of 165.60 (± 5.6), BIA (tetrapolar MALTRON 900) DE 24.5 (± 5.6), NIR (FUTREX 5000 A/ZL) 22.3 (± 5.0) and Hydrostatic Weighing 22.2 (± 5.7). In the statistical treatment, Student's t-test, paired method and Pearson's Correlation Method were used. The regression model used in this comparison was % F = 0.334 x P. ABD. + 0.315x DC. BICEPS + 0.246 x DC. THIGH – 2.543 x D. BIEST. With EPE (Standard Estimate Error) of 2.7, r (Correlation Index) of 0.99 and R2 (Coefficient of Determination) of 0.99. Comparing the model with the BIA method (tetrapolar MALTRON 900), an r = 0.8 and R2 = 0.7 was obtained, while comparing with the NIR (FUTREX 5000 A/ZL), an r = 0.6 was obtained and R2 = 0.4. It is concluded that, the results seen together, determine that the model presents a greater degree of significance with the BIA method than with the NIR.