Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan, ROC.
Eur J Appl Physiol. 2012 Jun;112(6):2205-12. doi: 10.1007/s00421-011-2198-3. Epub 2011 Oct 12.
The frequent use of the computer mouse was reported to be associated with the development of the musculoskeletal disorders in the wrist, forearm, and shoulder regions. This study was to examine the effect of the mouse weights and operation speeds on the wrist motion and muscle activity. 25 subjects (20 males and 5 females) were instructed to repetitively point-and-click the mouse between two targets displaced in the monitor with five different weighted mice (weights around 70, 100, 130, 160, and 190 g) at the fast (50 repetition/min) and slow (25 repetition/min) operation speeds. Surface electromyographic activity of the extensor carpi radialis, extensor carpi ulnaris, extensor digitorum, and upper trapezius muscles were recorded, and the electrogoniometer was used to register the wrist motions. The results showed that the maximal ulnar deviation was not significantly different among the examined conditions. The wrist movement range and the forearm muscle activities showed a V-shape tendency with the lowest value in the mouse weight of 130 g. This tendency was diminished during the slow speed tasks. The results suggested that the proper mouse weight could benefit the users in terms of increasing the movement efficiency and decreasing the muscular costs.
频繁使用鼠标被认为与腕部、前臂和肩部的肌肉骨骼疾病的发展有关。本研究旨在探讨鼠标重量和操作速度对腕部运动和肌肉活动的影响。25 名受试者（20 名男性，5 名女性）被要求使用 5 种不同重量的鼠标（重量约为 70、100、130、160 和 190 克），以快速（50 次/分钟）和慢速（25 次/分钟）的操作速度，在显示器上两个目标之间重复点击鼠标。记录伸腕肌、伸指总肌、尺侧腕伸肌和上斜方肌的表面肌电活动，用电角度计记录腕部运动。结果表明，在所检查的条件下，最大尺偏角没有显著差异。腕部运动范围和前臂肌肉活动呈 V 形趋势，在 130 克鼠标重量下达到最低值。这种趋势在低速任务中减少。结果表明，合适的鼠标重量可以提高运动效率，降低肌肉成本，从而使使用者受益。
