Validity of two type OMRON body composition analysers in karate athletes

The aim of this study was to examine the validity of two types of OMRON body composition analyzers (BF 511 and VIVA) in comparison with the InBody 270 body composition analyzer, in karatekas. The measurements were performed during the summer national camp of the FUDO-KAN Karate Federation, and the sample of subjects included 20 men and 27 women (BH = 158 ± 14.13 cm; BM = 51 ± 17.29 kg; BMI = 20 ± 4.01 kg/m2), and the following body composition variables were used: body mass (BM), body fat percentage (%BF) and skeletal muscle mass percentage (%SMM), which were estimated using all three body composition scales. Descriptive data (Mean, SD, Min, Max, cV%) were provided for all variables and in the case of assessing all three above-mentioned body composition analyzers, while the Pearson correlation coefficient (r) and the coefficient of determination (r2) were used to determine validity, both OMRON body composition analyzers with the "gold standard" in assessing body composition which is InBody 270 scale. By applying the r and r2 statistical tests, an extremely large correlation of BM InBody with BM OMRON (BF 511 - r = 1.000, r2 = 1.000; VIVA - r = 0.999, r2 = 0.998), an extremely large correlation of %BF InBody with %BF BF 511 (r = 0.927, r2 = 0.859) and a large correlation of %BF InBody with %BF VIVA (r = 0.63, r2 = 0.40), and finally, a large correlation of %SMM InBody with %SMM BF 511 (r =0.652, r2 = 0.425), and a moderate negative correlation of %SMM InBody with %SMM VIVA (r = -0.073, r2 = 0.005) were observed Although websites selling OMRON body composition analyzers claim that they are valid and accurate in assessing body composition, the results obtained clearly indicate that there are certain deviations, especially when it comes to assessing skeletal muscle, when compared with the InBody 270 body composition scale.