期刊
APPLIED ERGONOMICS
卷 44, 期 6, 页码 969-976出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apergo.2013.03.013
关键词
Biomechanical model; Muscle stress; Optimization; Tapping
资金
- NIOSH [R01OH008373]
- NIOSH ERC at Harvard University [T42OH008416-05]
Non-neutral wrist posture is a risk factor of the musculoskeletal disorders among computer users. This study aimed to assess internal loads on hand and forearm musculature while tapping in different wrist postures. Ten healthy subjects tapped on a key switch using their index finger in four wrist postures: straight, ulnar deviated, flexed and extended. Torque at the finger and wrist joints were calculated from measured joint postures and fingertip force. Muscle stresses of the six finger muscles and four wrist muscles that balanced the calculated joint torques were estimated using a musculoskeletal model and optimization algorithm minimizing the squared sum of muscle stress. Non-neutral wrist postures resulted in greater muscle stresses than the neutral (straight) wrist posture, and the stress in the extensor muscles were greater than the flexors in all conditions. Wrist extensors stress remained higher than 4.5 N/cm(2) and wrist flexor stress remained below 0.5 N/cm(2) during tapping. The sustained high motor unit recruitment of extensors suggests a greater risk than other muscles especially in flexed wrist posture. This study demonstrated from the perspective of internal tissue loading the importance of maintaining neutral wrist posture during keying activities. (C) 2013 Elsevier Ltd and The Ergonomics Society. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据