Functional Evaluation of Effective Muscular Strength Based on a Muscle Coordinate System Composed of Bi-articular and Mono-articular Muscles. Simplified Measurement Technique of Output Force Distribution.

It has been previously reported that the output force distribution at the wrist demonstrated in a hexagonal shape, and the conventional joint coordinate system discussed with only joint torque could not explain human output force characteristics. The results obtained in the present experiments were:1) Characteristics of the hexagonal output force distribution made it possible to estimate the hexagonal shape from only four measured output points. 2) All estimated hexagonal shapes of the subjects employed showed sufficient reproducibility and reliability, and could represent the output force characteristics of each subject. 3) Individual functional effective muscular strengths could be evaluated from the hexagonal output force distribution. And, this technique can be applied effectively to the field of rehabilitation or sport where the evaluation of muscle strength is needed.