Abstract
The EMG records muscular action potential in a body surface and the MMG (mechanomyogram) records micro vibration on the body surface caused by muscle contraction. In this study, the skeletal muscle contraction was evaluated multilaterally using an input EMG and output MMG. The authors used the original “MMG/EMG hybrid sensor” and evaluated muscle contraction when the subject carried out an isometric contraction and joint exercise of the biceps brachii muscle. As a result, in the case of the isometric contraction while changing muscle force, the acceleration MMG (second order differential of displacement MMG) and the EMG increased with increase of % MVC respectively but decreased from around 80% MVC. During the elbow joint exercise passively and actively, the acceleration MMG and EMG were not found in the passive exercise. In the case of active exercise, the acceleration MMG and EMG changed according to the joint angle. Thus, the authors could evaluate muscle contraction performance by measuring a myoelectric and myomechanical signal simultaneously. In future, the authors would apply it to a clinical study such as myopathy diagnoses, rehabilitation, sports training etc.
