Houwink Annemieke, Oude Hengel Karen M, Odell Dan, Dennerlein Jack T
VU University Amsterdam, Netherlands.
Hum Factors. 2009 Feb;51(1):46-55. doi: 10.1177/0018720808329843.
The purpose of this study is to determine if an alternative mouse promotes more neutral postures and decreases forearm muscle activity and if training enhances these biomechanical benefits.
Computer mouse use is a risk factor for developing musculoskeletal disorders; alternative mouse designs can help lower these risks. Ergonomic training combined with alternative input devices could be even more effective than alternative designs alone.
Thirty healthy adults (15 males, 15 females) performed a set of computer mouse tasks with a standard mouse and an alternative mouse while an electromagnetic motion analysis system measured their wrist and forearm postures and surface electromyography measured the muscle activity of three wrist extensor muscles. Fifteen participants received no training on how to hold the alternative mouse, whereas the remaining 15 participants received verbal instructions before and during use of the alternative mouse.
The alternative mouse was found to promote a more neutral forearm posture compared with the standard mouse (up to 11.5 degrees lower forearm pronation); however, pronation was further reduced when instructions on how to hold the mouse were provided. Wrist extensor muscle activity was reduced for the alternative mouse (up to 1.8% of maximum voluntary contraction lower) compared with the standard mouse, but only after participants received instructions.
The alternative mouse design decreased biomechanical exposures; however, instructions enhanced this potential ergonomic benefit of the design.
User knowledge and training are important factors when effectively implementing an alternative ergonomic device.
本研究旨在确定一种替代鼠标是否能促进更中立的姿势、降低前臂肌肉活动，以及训练是否能增强这些生物力学益处。
使用电脑鼠标是引发肌肉骨骼疾病的一个风险因素；替代鼠标设计有助于降低这些风险。将人体工程学训练与替代输入设备相结合可能比单纯的替代设计更有效。
30名健康成年人（15名男性，15名女性）使用标准鼠标和替代鼠标执行一组电脑鼠标任务，同时用电磁运动分析系统测量他们的手腕和前臂姿势，并用表面肌电图测量三块腕伸肌的肌肉活动。15名参与者未接受关于如何握持替代鼠标的培训，而其余15名参与者在使用替代鼠标之前和期间接受了口头指导。
与标准鼠标相比，发现替代鼠标能促进更中立的前臂姿势（前臂旋前角度低至11.5度）；然而，当提供如何握持鼠标的指导时，旋前角度进一步减小。与标准鼠标相比，替代鼠标的腕伸肌活动降低（最大自主收缩降低达1.8%），但这仅在参与者接受指导之后。
替代鼠标设计降低了生物力学暴露；然而，指导增强了该设计潜在的人体工程学益处。
在有效实施替代人体工程学设备时，用户知识和培训是重要因素。
