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The effects of prior warning and lifting-induced fatigue on trunk muscle and postural responses to sudden loading during manual handling

机译：预先警告和举重引起的疲劳对手动操作期间躯干肌肉和突然负荷的姿势反应的影响

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摘要

This study investigated the effects of warning and lifting-induced fatigue on trunk muscle activity and postural responses to sudden loading. Thirty-one male subjects were subjected to sudden loading of a hand-held box with and without prior warning, before and after either lifting-induced fatigue or light callisthenic exercises. Results showed that warning did not alter the level of trunk muscle activity prior to sudden loading. Following warning, there was a reduction in all muscle and joint onset latencies and the magnitude of hip and knee flexion. Although fatigue did not influence muscle and joint initiation, it did negate the effects that warning had on reducing joint displacement. These findings indicate that warning prior to sudden loading may enhance postural responses, reduce ranges of joint motion and increase stability. However, the benefits of prior warning for reducing ranges of joint motion may not be present when a person is fatigued. Sudden unexpected loading and fatigue arising from manual handling practices in the workplace have been identified as contributing factors to the risk of low back injury. Findings from this study provide information that is important for the design of interventions intended to reduce the incidence of manual handling-related back injuries.
机译：这项研究调查了警告和举重引起的疲劳对躯干肌肉活动和对突然负荷的姿势反应的影响。在举重引起的疲劳或轻度的健美操锻炼前后，有31位男性受试者突然受到手持式盒子的突然装载，有无事先警告。结果表明，警告并没有改变突然负荷前躯干肌肉的活动水平。警告后，所有肌肉和关节发作的潜伏期以及髋部和膝盖屈曲的幅度均降低。尽管疲劳并不影响肌肉和关节的起始，但它确实抵消了警告对减少关节移位的影响。这些发现表明，在突然施加负荷之前发出警告可能会增强姿势反应，减少关节运动范围并增加稳定性。但是，当人感到疲劳时，可能无法获得预先警告以减小关节运动范围的益处。在工作场所中进行手动操作会导致突然的意外负载和疲劳，这是造成下背部受伤风险的因素。这项研究的发现提供了信息，这些信息对于旨在减少与人工操作有关的背部伤害发生率的干预措施的设计非常重要。

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