Summary: The purpose of this study was to evaluate the ergonomic risk factors associated with manual lifting tasks using surface electromyography (EMG). 13 volunteers lifted loads of 6 and 13 kg at two speeds and at t...Summary: The purpose of this study was to evaluate the ergonomic risk factors associated with manual lifting tasks using surface electromyography (EMG). 13 volunteers lifted loads of 6 and 13 kg at two speeds and at two horizontal distances in 3 different postures and three boxes of different sizes, from floor to knuckle height, performing 72 lifting tasks. For each lift, the surface electromyography signals from the erector spinae muscles, bilaterally at T_~10 and L_3, was recorded. The ergonomic risk factors associated with manual lifting tasks were evaluated by comparing the average amplitude of EMG signals from the erector spinae muscles. The EMG average amplitude for lifting the load of 13 kg was 14.3 % greater than that for lifting the load of 6 kg (t=-10.93, P<0.01). The EMG average amplitude at the site of L_3 was 10.3 % greater than that at the site of T_~10 (t=-7.98, P<0.01). The EMG average amplitude when performing “fast” lift was 5.9 %greater than the “slow” lift (t=-4.63, P<0.01). The posture of lifting affected the EMG average amplitude. It was lowest with semi-squat posture and greatest with squat posture (F=27.76, P<0.01). The result of multiple stepwise regression analysis showed that the loads of lifting, the size of box, horizontal distance, posture of lifting, the site of the spine subjected to force, lifting speed were the factors affecting the EMG average amplitude. The most significant factor was the loads of lifting, followed by the site of the spine subjected to force and the lifting speed in terms of risk. The ergonomic risk factors associated with manual lifting tasks includes the loads, posture, lifting speed, horizontal distance, the site of the spine subjected to force etc. The results of signal amplitude of EMG from the erector spinae muscles showed that semi-squat posture is the best posture for lifting tasks.展开更多
目的总结国家标准GB/T31002.1的验证性实验研究过程,以指导国家标准的推广与应用。方法采用心理物理学法获取健康青年人不同提举高度、频率与水平距离下的最大可接受质量(Maximum acceptable weight of lift,MAWL),并分析MAWL与NIOSH手...目的总结国家标准GB/T31002.1的验证性实验研究过程,以指导国家标准的推广与应用。方法采用心理物理学法获取健康青年人不同提举高度、频率与水平距离下的最大可接受质量(Maximum acceptable weight of lift,MAWL),并分析MAWL与NIOSH手工提举方程质量推荐限值(RWL)间的差异。结果MAWL随三提举参数的增大呈显著降低趋势,多数RWL高于中国青年人的手工提举重物能力。结论国内青年人群应用NIOSH手工提举方程时,可通过调整提举高度系数与降低负荷常量予以修正。展开更多
目的为了解间歇拉物行走作业条件下拉力降幅特征,避免肌肉疲劳累积,降低工作相关肌肉骨骼损伤(WMSDs)风险,设计并组织间歇拉物行走试验。方法招募8名大学男生和11名大学女生进行试验,测量工休比为1,30 kg和40 kg 2种负荷、1 km/h和2 km/...目的为了解间歇拉物行走作业条件下拉力降幅特征,避免肌肉疲劳累积,降低工作相关肌肉骨骼损伤(WMSDs)风险,设计并组织间歇拉物行走试验。方法招募8名大学男生和11名大学女生进行试验,测量工休比为1,30 kg和40 kg 2种负荷、1 km/h和2 km/h 2种行走速度条件下的拉力值和主观疲劳评分(RPE),然后运用统计学方法分析性别、负荷以及行走速度对拉力值、拉力降幅、相对拉力降幅和RPE的影响。结果性别显著影响拉力降幅,40 kg负荷下拉力降幅更快,速度对拉力降幅影响不显著,不同负荷间RPE差异显著,但不同性别和速度间RPE差异不显著。结论间歇拉物行走作业条件下,男女拉力差异显著且男性抗疲劳能力更强,负荷显著影响拉力降幅,但速度影响不显著,拉物行走作业中行走速度2m/s优于1m/s。展开更多
文摘Summary: The purpose of this study was to evaluate the ergonomic risk factors associated with manual lifting tasks using surface electromyography (EMG). 13 volunteers lifted loads of 6 and 13 kg at two speeds and at two horizontal distances in 3 different postures and three boxes of different sizes, from floor to knuckle height, performing 72 lifting tasks. For each lift, the surface electromyography signals from the erector spinae muscles, bilaterally at T_~10 and L_3, was recorded. The ergonomic risk factors associated with manual lifting tasks were evaluated by comparing the average amplitude of EMG signals from the erector spinae muscles. The EMG average amplitude for lifting the load of 13 kg was 14.3 % greater than that for lifting the load of 6 kg (t=-10.93, P<0.01). The EMG average amplitude at the site of L_3 was 10.3 % greater than that at the site of T_~10 (t=-7.98, P<0.01). The EMG average amplitude when performing “fast” lift was 5.9 %greater than the “slow” lift (t=-4.63, P<0.01). The posture of lifting affected the EMG average amplitude. It was lowest with semi-squat posture and greatest with squat posture (F=27.76, P<0.01). The result of multiple stepwise regression analysis showed that the loads of lifting, the size of box, horizontal distance, posture of lifting, the site of the spine subjected to force, lifting speed were the factors affecting the EMG average amplitude. The most significant factor was the loads of lifting, followed by the site of the spine subjected to force and the lifting speed in terms of risk. The ergonomic risk factors associated with manual lifting tasks includes the loads, posture, lifting speed, horizontal distance, the site of the spine subjected to force etc. The results of signal amplitude of EMG from the erector spinae muscles showed that semi-squat posture is the best posture for lifting tasks.
文摘目的总结国家标准GB/T31002.1的验证性实验研究过程,以指导国家标准的推广与应用。方法采用心理物理学法获取健康青年人不同提举高度、频率与水平距离下的最大可接受质量(Maximum acceptable weight of lift,MAWL),并分析MAWL与NIOSH手工提举方程质量推荐限值(RWL)间的差异。结果MAWL随三提举参数的增大呈显著降低趋势,多数RWL高于中国青年人的手工提举重物能力。结论国内青年人群应用NIOSH手工提举方程时,可通过调整提举高度系数与降低负荷常量予以修正。
文摘目的为了解间歇拉物行走作业条件下拉力降幅特征,避免肌肉疲劳累积,降低工作相关肌肉骨骼损伤(WMSDs)风险,设计并组织间歇拉物行走试验。方法招募8名大学男生和11名大学女生进行试验,测量工休比为1,30 kg和40 kg 2种负荷、1 km/h和2 km/h 2种行走速度条件下的拉力值和主观疲劳评分(RPE),然后运用统计学方法分析性别、负荷以及行走速度对拉力值、拉力降幅、相对拉力降幅和RPE的影响。结果性别显著影响拉力降幅,40 kg负荷下拉力降幅更快,速度对拉力降幅影响不显著,不同负荷间RPE差异显著,但不同性别和速度间RPE差异不显著。结论间歇拉物行走作业条件下,男女拉力差异显著且男性抗疲劳能力更强,负荷显著影响拉力降幅,但速度影响不显著,拉物行走作业中行走速度2m/s优于1m/s。
