Měření elektroimpedanční myografie

Abstract

The thesis deals with the measurement of electroimpedance myography (EIM). The aim of the study was to evaluate whether the muscle impedance with the phase angle changes when the joint angle changes or when the muscle contracts, and to compare the obtained results with publications that deal with the same issues. At the beginning of the work is an introduction to the electrical properties of tissues, the basic principles of bioimpedance and EIM. Subsequently, review of literature, verification of the accuracy of the device is performed and a measurement is designed for 11 subjects, which uses a tetrapolar electrode connection on the biceps and then on the biceps and forearms. The impedance and phase angle are measured first for different elbow joint angles and then for different isometric contraction intensities using the supplied instrument. Measurement results are averaged according to individual sections and evaluated on the basis of tables and graphs. From the achieved outputs it can be claimed that the impedance and phase angle change due to changes in joint angle and also during different levels of isometric contraction of the measured muscles (impedance in the order of Ohms and the phase angle in decimal degrees).