Delisle Alain, Larivière Christian, Plamondon André, Imbeau Daniel
Robert-Sauvé Occupational Health and Safety Research Institute (IRSST) Canada, Montreal, Quebec H3A 3C2, Canada.
Ergonomics. 2006 Feb 10;49(2):139-60. doi: 10.1080/10610270500450739.
The aims of the study were: 1) to determine whether resting the forearms on the work surface, as compared to chair armrests, reduces muscular activation; 2) to compare the sensitivity of different electromyographic (EMG) summary parameters. Eighteen healthy subjects performed computer work (with keyboard and mouse alternately) for 20 min while resting their forearms on a work surface adjustable in height (Workstation A), on the chair's armrests with an adjustable workstation (Workstation B) or on their chair's armrests with a non-adjustable workstation (Workstation C). The EMG amplitude of the trapezius and deltoid muscles was little influenced by the workstations, whereas their EMG variability increased with Workstation A, which was interpreted as a positive effect. However, the EMG amplitude of the mouse-side extensor digitorum muscle was higher with Workstation A. Alternating between resting the forearms on the work surface and on the chairs' armrests could solicit different muscles during computer work, and could be considered as a strategy for preventing musculoskeletal disorders. The new exposure variation analysis summary parameters used were sensitive to small workstation changes, thus supporting their use in future studies.
1）确定与将前臂放在椅子扶手上相比，将前臂放在工作表面上是否能减少肌肉激活；2）比较不同肌电图（EMG）汇总参数的敏感性。18名健康受试者进行了20分钟的计算机工作（交替使用键盘和鼠标），同时将前臂放在高度可调节的工作表面上（工作站A）、放在带有可调节工作站的椅子扶手上（工作站B）或放在带有不可调节工作站的椅子扶手上（工作站C）。斜方肌和三角肌的肌电图幅度受工作站的影响较小，而它们的肌电图变异性随工作站A增加，这被解释为一种积极影响。然而，在工作站A时，鼠标侧指伸肌的肌电图幅度更高。在计算机工作期间，将前臂交替放在工作表面和椅子扶手上可能会调动不同的肌肉，并且可以被视为预防肌肉骨骼疾病的一种策略。所使用的新的暴露变化分析汇总参数对工作站的微小变化敏感，因此支持它们在未来研究中的使用。
