Electromyography Evaluation of Shoulder Muscle Co-activation for One-handed Handling
The aim of this study is to evaluate shoulder muscle co-activation for the one-handed handling of loads by surface electromyography (EMG). EMG signals were collected from six muscles of the right shoulder. Seven males repeated the one-handed handling of a load ten times in a transverse plane. They randomly moved the load weight from the center to the front (forward), from the front to the center (backward), from the center to the right (rightward) , and from the right to the center (leftward). The independent variables were the muscle (anterior deltoid, middle deltoid, posterior deltoid, upper trapezius, rhomboideus major and teres major) and the direction (forward, backward, rightward, and leftward), and the dependent variables were EMG activation in peak linear envelope (LE) and duration in time. The results of analysis of variance (ANOVA) showed significant main and interaction effects for both independent variables. The post-hoc multiple comparison tests revealed that the anterior deltoid had a larger LE than other muscles, and the forward and backward directions had larger LE than the rightward and leftward directions. However, the backward and leftward caused featured shorter activated duration than the forward and rightward because moving the arm to the center had a concentric ballistic effect of using the elastic energy stored in the eccentric phase.
shoulder one-handed handling electromyography linear envelope activated duration
Seung-Min Mo Jong-Seon Kwag Yong-Ku Kong Inseok Lee Myung-Chul Jung
Department of Industrial and Information Systems Engineering, Ajou University, South Korea Department of Industrial Engineering, Sungkyunkwan University, South Korea Department of Safety Engineering,Hankyong National University, South Korea
国际会议
The Institute Industrial Engineera Asian Conference 2011(2011年国际工业工程师协会亚洲会议)
上海
英文
186-191
2011-06-10（万方平台首次上网日期，不代表论文的发表时间）