Validity of Measuring Body Composition by Means of the BIA Method

*Petr Kutáč¹, Vojtěch Gajda¹, Miroslava Přidalová², Vít Šmajstrla³

Summary
Introduction. Body composition represents a significant diagnostic data item regarding the process of training. It also plays a role when we focus on health-based skills.
Aim. The aim of this study is to verify the validity of measuring body composition by means of the BIA method and to compare the results obtained with the results gained by means of the DEXA method. Two measurement modes (standard and athletic) have been considered.
Materials and methods. The group investigated consisted of 74 individuals (45 males, 29 females). The average age was 20.2 (males) and 19.5 (females). The DEXA method and BIA method were applied to measure body composition. So as to assess the validity of measurements the regression functions model was used. A level of significance α = 0.05 was applied to all statistical tests.
Results. The acquired value of the Pearson correlation was r = 0.753 (females) and r = 0.837 (males – athletic mode) and r = 0.817 (males – standard mode). The value d_max = ± 2 s_y/x was found to be ± 4.42% for females, and ± 2.38 for males (athletic mode) and ± 3.40 for males (standard mode), which is an error of objective significance.
Conclusion. The relatively high coefficient of correlation r cannot be considered as a guarantee of accurate measurements. When considering the accuracy of measurements, it is necessary to base the judgment on the value of d_max. It is not possible to combine the applied methods and to compare the acquired results with each other.

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