A method for estimating torque-vector directions of shoulder muscles using surface EMGs |
| |
Authors: | Naoki Yoshida Kazuhisa Domen Yasuharu Koike Mitsuo Kawato |
| |
Affiliation: | College of Medical Technology, Hokkaido University, Sapporo, Japan. yoshida@1994.jukuin.keio.ac.jp |
| |
Abstract: | In this study, a new method is proposed to estimate the torque-vector directions of each shoulder muscle. The method is based on a multiple regression model that reconstructs shoulder torque, which is calculated from the hand force and posture, from the surface EMG of many muscles recorded simultaneously. The torque-vector directions of eleven shoulder muscles of four subjects were obtained at up to 30 different arm postures with this method. The mean confidence interval (p < 0.05) of the estimated torque-vector direction of each subject was 7.7-10.6 degrees. The correlation coefficient between the measured shoulder torque and reconstructed shoulder torque was between 0.76-0.84. The results for majority of the muscles were in accordance with previous studies, and reasonable from the viewpoint of anatomy. The torque-vector directions of a muscle, which are estimated with this method, have more of a functional meaning than a pure anatomical or mechanical one. These indicate the direction of the shoulder torque accompanying the muscle activation for a normal shoulder action that involves the cooperative contraction of many muscles. |
| |
Keywords: | |
本文献已被 PubMed SpringerLink 等数据库收录! |
|