Source document position as it affects head position and neck muscle tension.
Source document position as it affects head position and neck muscle tension.
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源文档位置，因为它影响头部位置和颈部肌肉张力。
DOI：
10.1080/00140139608964483
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发表时间：
1996
期刊：
影响因子：
2.4
通讯作者：
Nancy Hamilton
中科院分区：
文献类型：
--
作者：
Nancy Hamilton
在阅读任务和打字（文字处理）任务中，对头部位置、C7机械负荷和颈部肌肉肌电图活动水平的测量进行了比较。作为主要视觉任务的源文档被放置在受试者前面的两个位置，一个平放在键盘两侧的桌子上，另一个放在键盘两侧的文档架上。在测量期间，20名受试者中的每一位都在每个文件位置执行阅读任务和打字任务。研究发现，当文件平放于桌上时，头部位置变化最大。每侧的这个体位也会使颈部伸肌和胸锁乳突肌产生最大程度的肌肉张力，程度较轻。此外，在打字条件下，文件位置测量之间的差异更大。
Measurements of head position, mechanical load at C7, and level of muscle EMG activity in the muscles of the neck were compared across six document positions in both a reading task and a typing (word processing) task. Source documents, identified as a primary visual task, were placed in two positions in front of the subject, flat on the table to each side of the keyboard, and on a document stand at each side of the keyboard. Each of the 20 subjects performed both a reading task and a typing task in each of these document positions while measurements were taken. It was found that the greatest variations in head position occurred in head rotation with documents flat on the table. This document position on each side also produced the greatest level of muscle tension in both the neck extensors and, to a lesser degree, the sternocleidomastoid muscles. In addition, greater variability between document position measures was found in the typing condition.