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首页> 外文期刊>International Journal of Industrial Ergonomics >The effects of speed and force of keyboard operation on neck-shoulder muscle activities in symptomatic and asymptomatic office workers
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The effects of speed and force of keyboard operation on neck-shoulder muscle activities in symptomatic and asymptomatic office workers

机译：有症状和无症状上班族的键盘操作速度和力度对颈肩肌肉活动的影响

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摘要

The study compared the EMG changes and discomforts experienced by a symptomatic and an asymptomatic group of office workers when they were challenged by the physical stressors of increased typing speed and increased typing force. 21 female office workers were recruited in the Case Group and 20 in the Control Group. Each subject had to perform 20 min of typing in 3 conditions: Normal, Faster and Harder; which described the requirement to work with normal speed and force, faster speed and harder force, respectively. The Case Group showed trends for higher muscle activities in all three conditions in both the upper trapezius and cervical erector spinae muscles. On the whole, there were greater increases in muscle activities in both groups under the Faster condition, implying that increasing the typing speed was a more difficult demand,, When the Case subjects were sub-divided into High and Low (Discomfort) Groups, greater differences in muscle activities were revealed. It was mainly the High Group that showed the greatest changes in terms of muscle activities and discomforts. The Low Group showed moderate increases in discomforts and muscle activities, while the Control Group showed minimal changes in both. The results supported the "Altered Motor Control" model in the symptomatic individuals who may also have developed a "heightened sensitivity" to physical stressors due to their prolonged history of discomforts in the past.
机译：这项研究比较了有症状和无症状的上班族在受到打字速度加快和打字力增加的生理压力的挑战时，EMG的变化和不适。案例小组招募了21名女性上班族，而对照组则招募了20名女性。每个受试者必须在3种情况下进行20分钟的打字：正常，更快和更困难;其中描述了分别以正常速度和力，更快的速度和更大的力工作的要求。病例组显示了斜方肌上部和颈直肌脊柱肌肉在所有三种情况下的较高肌肉活动的趋势。总体而言，在“较快”状态下，两组的肌肉活动都有较大的增加，这意味着提高打字速度是一个更加困难的要求。当将Case受试者分为高和低（不适）组时，更大揭示了肌肉活动的差异。在肌肉活动和不适方面，变化最大的主要是高级人群。低位组显示不适和肌肉活动有中等程度的增加，而对照组两者均显示出最小的变化。结果支持有症状个体的“改变运动控制”模型，这些个体由于过去长期的不适历史也可能对物理应激源产生“高度敏感性”。

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