A method of reconstruction of the muscular force profile from the EMG in the voluntary exercise

The paper deals with an original approach of reconstructing the muscular force profile, in voluntary exercise of human subjects. Based on the idea that the changes within the activation of the muscle are the most relevant factors in producing the muscular force, we built a dynamic estimator of the force within the isometric dynamic tasks (ACTM), using the surface EMG as an input signal. The exercise involved mainly the Biceps and Brachioradialis muscles, together. The estimated resultant force was built taking into consideration the weighted contribution of the acting muscles. The weights were taken as to match the actual force measured at the wrist within a steady contraction, then used accordingly, during the dynamic exercise. The results show a spectacular improvement over previous attempts. This may open a practical way towards the estimation of the resultant force at the joints.