Using EMG to Evaluate Ergonomic Problems of the Upper-extremity among the Long-time Mouse Use

• Main Authors: Pei-Hsun Lin, 林佩勳
• Other Authors: Chih-Wei Lu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/15912271217892673387

碩士 === 高雄醫學大學 === 職業安全衛生研究所 === 97 === The computer mouse is present in virtually every office environment now because of the recent adoption of the graphical user interface. The main objectives of this study were to observe the alternations of muscle fatigue resulting from the influence of continuous computer mouse using and to evaluate the applicability of surface electromyography (EMG) in characterizing low-force dynamics contractions. There were 60 subjects recruited who didn’t have musculoskeletal disorders of upper extremity in the past year. EMG was used to monitor the activities of extensor indicis proprius, flexor carpi ulnaris, middle deltoid and upper trapezius during the computer game playing. At the beginning, the end of playing game, respectively, subjects were asked to assess the upper-extremity muscles fatigue by a self-report questionnaire. The findings of study showed that all target muscles presented significant muscle fatigue by EMG measurement after two hours computer mouse use, especially for the flexor carpi ulnaris and upper trapezius. It was also found that the extent of self-report fatigue of all parts of upper-extremity increased. Finally, the workers would reach muscle fatigue in a daily work and computer mouse use increased risk of developing musculoskeletal disorders.