J0230404 Forearm Muscle Activation during Finger Loadings at Forearm Pronation and Supination

In the forearm, there are 19 muscles controlling finger motions. To measure the muscle activity in the forearm is essential to evaluate paralyzed muscles. In previous study, EMG-CT method was proposed to measure the muscle activity pattern in the forearm noninvasively. The aim of the current study was to investigate the muscle activity in the forearm during various finger loadings under the pronation, neutral, and supination positions of the forearm by using EMG-CT. Three healthy young males participated in the experiments. As a result, muscle activity pattern was different with the forearm positions. Activated area was rotated corresponding to the changes of muscle arrangements with the forearm positions and agreed with anatomical knowledge. Furthermore, the total muscle activity in the whole cross-section increased with the applied load in each loading condition. The study showed that the muscle activity pattern was observed corresponding to the muscle arrangement in the pronation, neutral, and supination positions by using EMG-CT.