筋骨格モデルを用いた筋張力推定におけるスケーリングの影響

抄録

There are two types of modeling of the human body: a rigid link model, which does not consider muscle activity, and a musculoskeletal model, which includes the force exertion characteristics of muscles. The musculoskeletal model is a mathematical expression of the dynamic properties of the musculoskeletal system. Combined with information obtained in measurements using an optical motion capture system and a force plate, they can be used to estimate muscle tension. Electromyography (EMG), which is the acquisition of the electrical signals generated by muscle contraction, is used to measure muscle tension. However, the measurement of surface EMG does not allow to measure individual muscle activity or deep muscle activity. Although needle electrodes enable individual muscle measurement, their use is highly invasive. Furthermore, because musculoskeletal models enable the non-invasive estimation of muscle tension, their use is promising in a wide range of fields. In musculoskeletal analysis, it is necessary to adjust the standard model to correspond to individual subjects. Different scaling settings yield different muscle tension results. Therefore, more accurate estimation of muscle tension can be expected by applying slightly different scaling settings for each segment, such as the thigh and lower leg. In this study, the musculoskeletal model software OpenSim is used to calculate the lower limb muscle tension during walking. Multiple scaling patterns are performed correspond to individual subjects to verify the effect of the determination of each bone length in scaling on the results of muscle tension.