Yung Marcus, Milosavljevic Stephan, Lang Angelica E, Tennant Liana M, Trask Catherine
Canadian Institute for Safety, Wellness, & Performance, Conestoga College Institute of Technology and Advanced Learning, Kitchener, N2G 4M4 Ontario, Canada.
School of Rehabilitation Science, College of Medicine, University of Saskatchewan, Saskatoon, S7N 2Z4 Saskatchewan, Canada.
Ann Work Expo Health. 2024 Sep 27;68(8):779-790. doi: 10.1093/annweh/wxae051.
Whole body vibration (WBV) is linked to short- and longer-term adverse health outcomes, including cognitive impairment, stress and memory loss, loss of balance, reduced proprioception, visual and vestibular disturbances, gastrointestinal problems, and musculoskeletal disorders. Epidemiological evidence supports the link between WBV and headache and head discomfort, but few experimental studies have examined this relationship, particularly with increased muscle tension, as an intermediary. This study aimed to investigate the relationship between muscle tension and vibration intensity, between perceived neck pain and headache/head discomfort and vibration intensity, and between muscle tension and reported neck pain and headache symptoms from simulated WBV based on field measurements of all-terrain vehicle operation on farm terrain. We observed significantly higher electromyography amplitude in the High condition (equivalent to EU Directive's Exposure Limit Value) compared to both Low (equivalent to EU Directive's Exposure Action Value) and Control (quiet sitting) conditions at the left upper trapezius muscle but there were no significant time effects. Neck pain and headache/head discomfort significantly increased after both Low (91% increase from baseline) and High (154% increase from baseline) vibration conditions but there were no significant differences between conditions. Based on simple regression modeling, the relationship between muscle activity and neck pain or headache was very weak (R2 = 0-0.093). Given the possibility of multiple factors contributing to headache symptoms, future research should not only consider the role of muscle tension but also sensory conflict, excessive noise, biodynamic responses, and a combination of these factors.
全身振动（WBV）与短期和长期不良健康后果相关，包括认知障碍、压力和记忆力减退、平衡能力丧失、本体感觉降低、视觉和前庭功能障碍、胃肠道问题以及肌肉骨骼疾病。流行病学证据支持WBV与头痛和头部不适之间的联系，但很少有实验研究探讨这种关系，特别是将肌肉紧张度增加作为中介因素的情况。本研究旨在基于在农田地形上全地形车操作的现场测量，研究肌肉紧张度与振动强度之间的关系、感知到的颈部疼痛和头痛/头部不适与振动强度之间的关系，以及肌肉紧张度与模拟WBV报告的颈部疼痛和头痛症状之间的关系。我们观察到，与低强度（相当于欧盟指令的暴露行动值）和对照（安静坐姿）条件相比，高强度（相当于欧盟指令的暴露限值）条件下左上斜方肌的肌电图振幅显著更高，但没有显著的时间效应。低强度（比基线增加91%）和高强度（比基线增加154%）振动条件后，颈部疼痛和头痛/头部不适均显著增加，但不同条件之间没有显著差异。基于简单回归模型，肌肉活动与颈部疼痛或头痛之间的关系非常弱（R2 = 0 - 0.093）。鉴于多种因素可能导致头痛症状，未来的研究不仅应考虑肌肉紧张度的作用，还应考虑感觉冲突、过度噪音、生物动力学反应以及这些因素的综合作用。
