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首页> 外文期刊>Ergonomics >Effects of work experience on fatigue-induced biomechanical changes during repetitive asymmetric lifts/lowers
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Effects of work experience on fatigue-induced biomechanical changes during repetitive asymmetric lifts/lowers

机译：工作经历对反复不对称升降过程中疲劳引起的生物力学变化的影响

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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.
机译：反复抬高/降低与工作相关的下背部疾病（WRLBD）的风险增加，疲劳可能加剧这种风险。经验丰富的工人使用的工作方法是开展工人培训以减少WRLBD的潜在模型，尽管经验是否会改变疲劳对WRLBD风险的影响尚不清楚。在这里，六名新手和六名经验丰富的工人完成了185次重复，不对称的升降机循环。分别使用躯干运动学/动力学，线性/角动量和李雅普诺夫指数评估身体需求，全身平衡和躯干运动稳定性。疲劳引起的运动策略改变很明显。新手减少，有经验的工人在疲劳后的峰值腰部弯矩增加，这表明前者在躯体动力学方面的WRLBD风险较低。但是，除了腰部力矩外，疲劳还大大减少了躯干扭转速度和加速度的组水平差异。因此，就WRLBD风险而言，经验丰富的工人的疲劳后运动策略似乎没有优势。

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