An Elbow-Biomechanical Modeling Based on sEMG

An elbow biomechanical model can provide theoretical guidance for the rehabilitation of the human arm. Researches on the mechanism of elbow movement are developed mainly through analysis of surface electromyographic(sEMG), but the signals that were captured are redundant, without the consideration of muscle groups, while output of the model are mostly muscle force or torque, which is not intuitive. In this paper, through the establishment of muscle-force model as well as the joint dynamics to calculate angle trajectory of the elbow joint, a sEMG to elbow joint angle model can be built. In order to express the active forces of the muscle groups with the specified muscles, a modified muscle groups matrix (MGM) was introduced. By experiments, the model without MGM has a large error while the deviation can decline when the MGM is introduced. In this way, the model is more precise to reflect the applied forces to elbow joint by the attached muscle groups.