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Testing the efficacy of an ergonomic lifting aid at diminishing muscular fatigue in women over a prolonged period of lifting

机译:测试人体工学的举重助剂在长时间举重中减轻女性肌肉疲劳的功效

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摘要

A personal lift assist device (PLAD) was designed with passive elastic elements that act with a similar line of action to the spine muscles and reduce the extension moment experienced during lifting activities. The purpose of this paper was to evaluate the device's ability to reduce fatigue during a repetitive lifting task. Women (n = 12) lifted a box load representing 20% maximal extensor strength repetitively (12 lift/ lowers per minute) for 45 min while electromyography (EMG) was recorded from the lumbar and thoracic erector spinae, and cardiovascular measures were monitored. Subjects were also tested on strength and endurance tests prior to, and after lifting. The increase in EMG RMS amplitude from the start until the end of the lifting session was significantly lower when wearing the PLAD for the TES (91% vs 3%) and the LES (104% vs 16%). The median frequency (MF) drop was also significantly lower when wearing the PLAD for TES and LES. The PLAD delayed the onset of fatigue in women by requiring less muscular effort Relevance to industry. There are numerous industries that still require repetitive manual materials handling tasks to be performed by humans. Repetitive lifting fatigues the musculature involved and may lead to an increased risk of injury. The PLAD reduced fatigue on several measures. This device appears to have potential for industries where women perform repetitive, fatiguing lifts.
机译:一种个人举升辅助设备(PLAD),它设计有被动弹性元件,其作用力与脊椎肌肉相似,并减少了举升过程中遇到的伸展力矩。本文的目的是评估设备在重复提升任务中减轻疲劳的能力。妇女(n = 12)重复举起代表20%最大伸肌力量的箱子负荷(每分钟12次举升/降低),持续45分钟,同时记录了腰椎和胸廓竖脊肌的肌电图(EMG),并监测了心血管指标。在抬举之前和之后,还对受试者进行强度和耐力测试。当穿着TES的PLAD(91%vs 3%)和LES(104%vs 16%)时,从起重阶段开始到结束阶段,EMG RMS幅度的增加明显降低。当穿着TES和LES的PLAD时,中值频率(MF)下降也明显更低。 PLAD通过减少与肌肉相关的肌肉活动而延迟了女性的疲劳发作。许多行业仍然需要人工执行重复的手动物料处理任务。反复举重会使所涉及的肌肉组织疲劳,并可能导致受伤的风险增加。 PLAD通过多种措施减少了疲劳。对于女性进行重复,疲劳的举重的行业,此设备似乎具有潜力。

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