Estimation method of functionally effective muscular strength based on the mono-articular and bi-articular muscles of the upper limbs

Abstract

We previously reported that the output force distribution at the wrist demonstrated in the hexagonal shape, and the characteristic of the hexagonal output force distribution was suggested by the theoretical analysis of the two joint link model with the muscle coordinate system. The muscle coordinate system is composed of the three pairs of antagonistic muscles consist of mono- and bi- articular antagonistic muscles. The difference between distribution calculated muscle coordinate system and distribution calculated joint coordinate system consists of two joint torques was clarified. The individual functional effective muscular strengths could be evaluated from the hexagonal output force distribution. And, we were proposed measuring method that used the portable measuring system of the functional effective muscular strengths. In this study, developed the application of the portable measuring system, and clarified the effectiveness of the application.