2.6. Assessment of Factors Influencing Performance of sEMG-Interface in Synthetic Tests

To test the correlation between the classification error and anatomic features of the users, for each subject we estimated the amount of fatty tissue in the body by the fat monitor OMRON BF306. Personal anthropometric characteristics, i.e., weight, height, age, and sex were introduced into the analyzer. The device measures the impedance from hand to hand and calculates the body fat (BF) in percentage based on the collected data. In our study, the subjects had the BF index in the range (4, 44)%.

Each body movement involves contraction and extension of various muscles. These concurrent processes must be perfectly synchronized and tuned to perform movements optimal in terms of the energy consumption and precision. To verify the influence of the “muscle functional efficiency” of a subject on the sEMG-interface performance, we developed a novel measure: the coefficient of activation of synergist-antagonist muscles or SAC. It will be thoroughly discussed in Section 3.2.