Effects of work experience on fatigue-induced biomechanical changes during repetitive asymmetric lifts/lowers
Effects of work experience on fatigue-induced biomechanical changes during repetitive asymmetric lifts/lowers
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DOI：
10.1080/00140139.2014.957733
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发表时间：
2014-12-02
期刊：
影响因子：
2.4
通讯作者：
Kyung, Gyouhyung
中科院分区：
文献类型：
--
作者：
Lee, Jungyong;Nussbaum, Maury A.;Kyung, Gyouhyung
重复的升降与工作相关的下背部疾病（WRLBD）的风险增加有关，疲劳可能会加剧这种风险。经验丰富的工人使用的工作方法是开发工人培训以减少WRLBD的潜在模式，尽管经验是否会改变疲劳对WRLBD风险的影响在很大程度上是未知的。在这里，六名新手和六名经验丰富的工人完成了185个重复的不对称升降循环。使用躯干运动学/动力学，线性/角动量和李雅普诺夫指数，分别评估身体需求，全身平衡和躯干运动稳定性。运动策略的几个疲劳引起的变化是明显的。新手减少和有经验的工人增加峰值腰椎力矩疲劳后，表明较低的WRLBD风险前者的躯干动力学。但是，除了腰椎力矩外，疲劳显著降低了躯干扭转速度和加速度的组间差异。因此，有经验的工人疲劳后的运动策略似乎并不有利于WRLBD的风险。
Repetitive lifting/lowering is associated with an increased risk of work-related low back disorders (WRLBDs), and fatigue may exacerbate such risk. Work methods used by experienced workers are potential models for developing worker training to reduce WRLBDs, though whether experience modifies the effects of fatigue on WRLBD risk is largely unknown. Here, six novices and six experienced workers completed 185 cycles of repetitive, asymmetric lifts/lowers. Physical demands, whole-body balance and torso movement stability were assessed using torso kinematics/kinetics, linear/angular momenta and Lyapunov exponents, respectively. Several fatigue-induced changes in movement strategies were evident. Novices decreased and experienced workers increased peak lumbar moments post-fatigue, suggesting lower WRLBD risks among the former in terms of torso kinetics. Other than lumbar moments, though, fatigue substantially reduced group-level differences in torso twisting velocities and accelerations. Post-fatigue movement strategies of experienced workers thus did not appear to be advantageous in terms of WRLBD risk.