Hasegawa T, Kumashiro M
Department of Industrial Engineering and Management, Kyushu School of Engineering, Kinki University, Japan.
Appl Human Sci. 1998 Jul;17(4):123-9. doi: 10.2114/jpa.17.123.
The constrained posture used for work using a visual display terminal (VDT), such as data entry, can produce static muscular fatigue. Based on the application of ergonomic principles, we conducted an experiment using a prototype VDT chair designed with an armrest adjustable to heights from 22 to 28 cm. The experiment--conducted to assess the static muscular strain based on varying heights of the armrest and distance from the keyboard--was performed with male subjects. The subjects were asked to input five-figure numbers using the 10 keys arranged on the right side. Using a surface electromyogram, we measured the strain imposed on the arm and the shoulder. This was followed up with a performance, weight-loading onto the armrests and a questionnaire. Results show that use of armrests is effective for the alleviation of muscles in one-handed keyboard operation where operators work on a desk whose height is unadjustable according to their body height or where operators are unable to rest their wrist on the desk. A chair with height-adjustable armrests is considered desirable when used by several people.
使用视觉显示终端（VDT）进行工作时所采用的受限姿势，如数据录入，会产生静态肌肉疲劳。基于人体工程学原理的应用，我们使用了一款原型VDT椅进行了一项实验，该椅子的扶手高度可在22至28厘米之间调节。该实验旨在根据扶手的不同高度和与键盘的距离来评估静态肌肉应变，实验对象为男性。要求受试者使用右侧排列的10个按键输入五位数数字。我们使用表面肌电图测量了施加在手臂和肩部的应变。随后进行了一项操作测试、在扶手上加载重量以及问卷调查。结果表明，在单手键盘操作中，当操作员在高度无法根据其身高进行调节的桌子上工作，或者操作员无法将手腕放在桌子上休息时，使用扶手对于缓解肌肉疲劳是有效的。当供多人使用时，带有高度可调节扶手的椅子被认为是理想的。
