Safety, Health, and Industrial Hygiene Department, Montana Tech University, Butte, MT, USA.
Department of Liberal Studies, Montana Tech University, Butte, MT, USA.
Work. 2020;66(2):437-443. doi: 10.3233/WOR-203183.
To investigate the effect of wearing hard hats on the lower cervical and upper thoracic region using surface electromyography (sEMG) and possible link to work-related musculoskeletal disorder (WRMSD).
Twenty study subjects wore sEMG sensors placed on the upper trapezius muscle on their dominant side to assess muscle activity while wearing different hard hats. Study subjects were asked to don six different hard hats and assume varied neck postures. A repeated-measures design was used to analyze the results for difference and similarities in muscle activity.
There was a small, significant effect of wearing a hard hat on muscle loading in the upper trapezius (p = 0.038). Post-hoc analyses revealed the only statistically significant difference was between wearing no hard hat at all and wearing head protection (without accessories) in the flexed posture (p = 0.006).
The results demonstrated that there was little difference in lower cervical and upper thoracic muscle activity while donning hard hat and assuming various neck postures. Wearing a sample of commonly used hard hats in this study does not appear to substantially increase muscle activity that would cause fatigue in the lower cervical and upper thoracic region among young, healthy volunteer subjects.
使用表面肌电图（sEMG）研究戴硬帽对下颈椎和上胸椎区域的影响，以及与工作相关肌肉骨骼障碍（WRMSD）的可能联系。
20 名研究对象在优势侧的上斜方肌上佩戴 sEMG 传感器，以评估戴不同硬帽时的肌肉活动。要求研究对象佩戴六种不同的硬帽，并采取不同的颈部姿势。使用重复测量设计来分析肌肉活动差异和相似性的结果。
戴硬帽对斜方肌上部的肌肉负荷有轻微但显著的影响（p=0.038）。事后分析显示，唯一具有统计学意义的差异是在弯曲姿势下不戴硬帽与戴无附件的头部保护装置（p=0.006）之间。
结果表明，戴硬帽和采取各种颈部姿势时，下颈椎和上胸椎的肌肉活动差异很小。在这项研究中，佩戴一组常用的硬帽似乎不会显著增加导致年轻健康志愿者下颈椎和上胸椎区域疲劳的肌肉活动。
