measurement uncertainty, method reliability, body composition

For purposes of our study we decided to use Method uncertainty type A (statistical processing of measured data). To formulate diagnostic error for the BIA method we used a solution proposed by HOPKINS [16] who deduces so-called typical (standard) error of measurement from differences between pairs of repeated measurements - which is in principle a mean error of the test. The research was realized on the group of 10 students whose field of study is physical education and sport. These students were chosen from the total number of 74 students in such a way that they represent as wide fat fraction as possible. Representation of their fat fraction oscillated between 9.0 to 31.2 % of body fat. Input value of body fat, which was the basic criterion for selection of students to the measurement etalon, was determined by the DEXA method.