滑鼠操作有無前臂支撐姿勢對於肩頸肌肉活化程度之影響

Effect of the Shoulder-Neck Muscle Activations in Mouse Operation Postures with/without Upper Extremity Support

侯易佑(Yi-You Hou) ； 楊志鴻(Chich-Haung Yang) ； 何文獻(Wen-Hsien Ho) ； 吳汶蘭(Wen-Lan Wu) ； 張志仲(Jyh-Jong Chang) ； 林槐庭(Hwai-Ting Lin) ； 郭藍遠(Lan-Yuen Guo)

《物理治療》 35卷4期 (2010/12) Pp. 300-307

摘要

Purposes: Mouse operation may account for 30-80% of working time spent at the computer. The computer mouse became an important tool for the operation of computers as operating systems and software applications have evolved to graphics based windowed environments. Sustained improper postures and muscle activities are primary risk factors to contribute to the musculoskeletal injuries of upper extremity. Many online players may use maneuver posture that may lead to more loads on shoulder and neck to more loads on shoulder and neck to improve their performance. This study aimed to evaluate the effect on the shoulder-neck muscle activation at different mouse operation positions. Methods: Eight healthy volunteers (aged 18~28 years old and mean age is 21.63) participated in this experil11ent. We used surface EMG (EMG-MA30, Motion Lab System, Inc., LA, USA) to measure shoulder-neck muscles activities in two tasks and muscles activation. Surface electrodes were placed on top of the anterior deltoid, the medial deltoid, the upper trapeziums, brachioradialis and flexor digitorum muscle bellies. While subjects used the maneuver posture (i.e. forearm non-support) and general posture (i.e. forearm support) to conduct computer games twenty seconds. The paired t-tests were then used to compare muscle activities values between the different tasks. Results: Higher level of mean and maximum muscle activity in maneuver posture was found compared to that of general posture. The upper trapeziums, anterior deltoid, medial deltoid, brachioradialis and the flexor digitorum mean muscle activities in maneuver posture were 10.82.5.38. 4.76.9.36 and 8.45 (MVC%), respectively. In general posture, the upper trapeziums, anterior deltoid, medial deltoid, brachioradialis and the flexor digitorum mean muscle activities were 5.93. 4.79, 3.99, 7.85, 8.01 (MVC%). respectively. The upper trapeziums maximum (4.89 MVC%) and mean muscle activities and (7.57 MVC%) in maneuver posture were significantly difference (p＜0.05) compared to in general posture. Conclusion: The ma neuver posture may easily lead to shoulder-neck muscle continuous activity; and that causes the muscle fatigue, pain. and so on for the long time. Clinical Relevance: The findings in this study provided useful information for clinical persons to suggest the correct posture to reduce the upper extremity problem.

關鍵字

電腦滑鼠 ； 表面肌電圖儀 ； 肩頸肌肉 ； 肌肉活化 ； 最大自主收縮

並列摘要

Purposes: Mouse operation may account for 30-80% of working time spent at the computer. The computer mouse became an important tool for the operation of computers as operating systems and software applications have evolved to graphics based windowed environments. Sustained improper postures and muscle activities are primary risk factors to contribute to the musculoskeletal injuries of upper extremity. Many online players may use maneuver posture that may lead to more loads on shoulder and neck to more loads on shoulder and neck to improve their performance. This study aimed to evaluate the effect on the shoulder-neck muscle activation at different mouse operation positions. Methods: Eight healthy volunteers (aged 18~28 years old and mean age is 21.63) participated in this experil11ent. We used surface EMG (EMG-MA30, Motion Lab System, Inc., LA, USA) to measure shoulder-neck muscles activities in two tasks and muscles activation. Surface electrodes were placed on top of the anterior deltoid, the medial deltoid, the upper trapeziums, brachioradialis and flexor digitorum muscle bellies. While subjects used the maneuver posture (i.e. forearm non-support) and general posture (i.e. forearm support) to conduct computer games twenty seconds. The paired t-tests were then used to compare muscle activities values between the different tasks. Results: Higher level of mean and maximum muscle activity in maneuver posture was found compared to that of general posture. The upper trapeziums, anterior deltoid, medial deltoid, brachioradialis and the flexor digitorum mean muscle activities in maneuver posture were 10.82.5.38. 4.76.9.36 and 8.45 (MVC%), respectively. In general posture, the upper trapeziums, anterior deltoid, medial deltoid, brachioradialis and the flexor digitorum mean muscle activities were 5.93. 4.79, 3.99, 7.85, 8.01 (MVC%). respectively. The upper trapeziums maximum (4.89 MVC%) and mean muscle activities and (7.57 MVC%) in maneuver posture were significantly difference (p＜0.05) compared to in general posture. Conclusion: The ma neuver posture may easily lead to shoulder-neck muscle continuous activity; and that causes the muscle fatigue, pain. and so on for the long time. Clinical Relevance: The findings in this study provided useful information for clinical persons to suggest the correct posture to reduce the upper extremity problem.

並列關鍵字

Computer mouse ； Electromyography EMG ； Shoulder-neck muscle ； Muscle activity ； Maximum voluntary contraction MVC