Frequency of cyclic lumbar loading is a risk factor for cumulative trauma disorder.
Frequency of cyclic lumbar loading is a risk factor for cumulative trauma disorder.
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周期性腰椎负荷的频率是累积性创伤障碍的危险因素。
DOI：
10.1002/mus.21019
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发表时间：
2008
期刊：
影响因子：
3.4
通讯作者：
Solomonow,Moshe
中科院分区：
文献类型：
--
作者：
Lu,Dawei;Le,Peter;Davidson,Bradley;Zhou,BingHe;Lu,Yun;Patel,Vikas;Solomonow,Moshe
流行病学研究表明，重复性（周期性）职业活动导致累积性创伤障碍（CTD），运动的频率或速度是危险因素之一。目前尚无证实流行病学的实验神经生理学证据。评估了多裂肌对腰椎前屈-后伸中循环载荷的反应，以检验高频载荷可能诱发急性神经肌肉疾病导致CTD的假设。对两组猫制备物施加峰值为20 N的循环载荷：一组在0.25 Hz，另一组在0.5 Hz，循环次数相同。在整个负荷期间以及负荷休息期后7小时休息期内的单循环测试期间，记录肌电图（EMG）、腰椎位移和负荷。开发了一个模型来量化蠕变和神经肌肉反应，并应用方差分析（ANOVA）来评估结果的显著性。暴露于0.5 Hz的组在负荷期间表现出自发性痉挛，随后是持续性痉挛。在7小时恢复期内，在最后5小时内存在显著（P< 0.001）迟发性兴奋过度以及多裂肌持续痉挛，证实存在显著（P< 0.024至P < 0.042）急性神经肌肉疾病。腰椎的高频循环负荷可能引发严重的急性神经肌肉疾病，表现为持续性痉挛和迟发性兴奋过度，应视为风险因素。我们建议工人避免高频率暴露于周期性活动，以防止累积性创伤障碍的发展。肌肉神经，2008年
Epidemiologic studies indicate that repetitive (cyclic) occupational activities lead to a cumulative trauma disorder (CTD), and the frequency or velocity of the movement is one of the risk factors. Experimental neurophysiological evidence to confirm the epidemiology is not available. The response of the multifidus muscles to cyclic loading in anterior lumbar flexion–extension was assessed to test the hypothesis that high‐frequency loading may induce an acute neuromuscular disorder leading to CTD. Two groups of feline preparations were subjected to cyclic loading with a peak of 20 N: one at 0.25 HZand the second at 0.5 HZ, with an equal number of cycles. Electromyogram (EMG), lumbar displacement and load were recorded throughout the loading periods and during single‐cycle tests over a 7‐hour rest period following the load–rest sessions. A model was developed to quantify the creep and neuromuscular responses, and analysis of variance (ANOVA) was applied to assess significance of the results. The group exposed to 0.5 HZexhibited spontaneous spasms followed by sustained spasms during the loading periods. During the 7‐hour recovery period, a significant (P< 0.001) delayed hyperexcitability as well as sustained spasms of the multifidi were present in the last 5 hours, confirming a significant (P< 0.024 toP< 0.042) acute neuromuscular disorder. High‐frequency cyclic loading of the lumbar spine may trigger a severe acute neuromuscular disorder, as evidenced by the sustained spasms and delayed hyperexcitability, and should be considered as a risk factor. We suggest that workers avoid high‐frequency exposure to cyclic activity in order to prevent the development of cumulative trauma disorder. Muscle Nerve, 2008