Reliability of body composition measurement by the BIA Method (bioelectric impedance)

*Petr Kutáč

Summary
Introduction. The basic condition for credibility of the measured values for all the used methods is their standardization. Aside from complying with standard measuring conditions it includes especially knowledge of the method´s validity and reliability.
Aim. The aim of this study is to estimate the specific reliability of body composition measurement by the BIA Method (using TANITA 418 MA device), by means of its parallel form generated by multiple repetition of the given measurement.
Material and methods. The experimental sample group comprised of 91 students of Physical Education (53 men and 38 women) whose average age was 20.5 and 20.1 years, respectively. A tetrapolar bioimpedance weighing machine TANITA 418 MA was used for measurement of body fat ratio by the BIA method. For estimation of the specific reliability we used a calculation of correlation coefficient between two parallel forms of measurement. All the statistic tests were realized on a significance level α/symbol> = 0.05.
Results. The values of Pearson correlation coefficient (r_XX') exceeded 0.970 in all tested parameters. The value of body weight was calculated as 1.000. The values of standard test error (SE) for monitored parameters oscillated between 0.06-0.12.
Conclusion. With regard to the high values of r_XX' and low values of SE we are able to assess the impact ratio of the external intervention affecting the changes in body composition even in relatively small changes of the monitored parameters. The basic condition for this is a strict complying with the standard measurement conditions.

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