University of Iowa, Occupational and Environmental Health, UI Research Park, Iowa City, IA 52242, USA.
Appl Ergon. 2011 Jul;42(5):725-34. doi: 10.1016/j.apergo.2010.11.007. Epub 2010 Dec 22.
We investigated the effect of an alternative welding system designed to reduce exposure to extreme trunk flexion on measures of trunk inclination and muscle activity. Among 10 participants, data were collected while using conventional stud welding equipment and while using the alternate system. Paired t-tests were used to compare results between the two welding systems. Mean trunk inclination angle was reduced with the alternate system (34.4° versus 9.7°, p < 0.01). Percent time with trunk inclination angles greater than 60° was also reduced (40.0% versus 4.7%, p < 0.01). In general, the alternate system resulted in less desirable upper trapezius muscle activity levels. The alternate system appears to be effective in reducing exposure to extreme trunk flexion among stud welders. Continued development of the system should explore features designed to reduce shoulder forces and improve productivity.
我们研究了一种旨在减少极端躯干弯曲暴露的替代焊接系统对躯干倾斜和肌肉活动测量的影响。在 10 名参与者中，同时使用传统螺柱焊接设备和替代系统收集数据。使用配对 t 检验比较两种焊接系统的结果。替代系统的平均躯干倾斜角度降低（34.4°对 9.7°，p < 0.01）。躯干倾斜角度大于 60°的时间百分比也降低（40.0%对 4.7%，p < 0.01）。一般来说，替代系统导致上斜方肌的活动水平不太理想。替代系统似乎能有效地减少螺柱焊工对极端躯干弯曲的暴露。该系统的进一步开发应探索旨在减少肩部力量和提高生产力的功能。
