Institute of Human Factors and Ergonomics, Shenzhen University, Shenzhen 518060, China.
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China.
Int J Environ Res Public Health. 2022 Mar 9;19(6):3207. doi: 10.3390/ijerph19063207.
Load knowledge has been identified as a factor affecting the risk of low back pain (LBP) during symmetric lifting. However, the effects of load knowledge in asymmetric lifting tasks have not been reported yet. The purpose of this study was to investigate the load knowledge influence on lifting biomechanics in asymmetric lifting tasks; Methods: Twenty-four male adults were recruited to complete a psychophysical lifting capacity test and a simulated asymmetric lifting task. The lifting task was set with load knowledge of 'no knowledge' (NK), 'weight known' (WK), 'fragile material known' (FK), and 'weight and fragile material known' (WFK) for different lifting load weights. Trunk kinematics and kinetics were collected and analyzed; Results: When fragility information was presented, trunk sagittal flexion acceleration, lateral flexion velocity and acceleration, and average lateral bending moment were significantly lowered at the deposit phase. Lifting a high load weight was found to significantly increase low back sagittal bending moment at the lifting phase and low back moments of all three dimensions at the deposit phase; Conclusions: The decrease of trunk kinematic load suggests that providing material fragility information to workers in asymmetric lifting tasks would be effective in reducing their risk of LBP.
负荷知识被认为是影响对称举升中腰痛（LBP）风险的因素。然而，关于不对称举升任务中负荷知识的影响尚未有报道。本研究旨在探讨不对称举升任务中负荷知识对举升生物力学的影响；方法：招募了 24 名成年男性，完成了一项心理物理举升能力测试和一项模拟不对称举升任务。为不同的举升负荷重量设置了“无知识”（NK）、“已知重量”（WK）、“易碎材料已知”（FK）和“重量和易碎材料已知”（WFK）的负荷知识。收集并分析了躯干运动学和动力学数据；结果：当呈现易碎信息时，在放置阶段，躯干矢状面屈曲加速度、横向屈曲速度和加速度以及平均横向弯曲力矩显著降低。在提升阶段，高负荷重量会显著增加腰椎矢状面弯曲力矩，在放置阶段也会显著增加所有三个维度的腰椎力矩；结论：躯干运动学负荷的降低表明，在不对称举升任务中向工人提供材料易碎信息将有助于降低他们患腰痛的风险。
