The Ergonomics Laboratory, Department of Industrial and Manufacturing Systems Engineering, Iowa State University, Ames, IA 50011-2164, USA.
Ergonomics. 2010 Aug;53(8):1033-8. doi: 10.1080/00140139.2010.494458.
Trunk kinematics variables have been shown to be related to low back injury risk during lifting tasks and it was hypothesised that changes in hand-hold positions could influence trunk kinematics and thereby risk. Fourteen subjects lifted a 5 or 10 kg box using four different hand placement locations (two symmetric and two asymmetric) while their trunk kinematics (position, velocity and acceleration in the sagittal, coronal and transverse planes) were captured using the lumbar motion monitor (LMM). These kinematics data were then used to calculate the probability of high risk group membership (PHRGM) as defined in the LMM risk assessment model. The results showed significant effects of hand placement on trunk kinematics, resulting in significant changes in the PHRGM variable ranging from a low of 20% in a the symmetric low load condition to a high of 38% under the asymmetric, 10 kg condition. STATEMENT OF RELEVANCE: Manual materials handlers use a variety of hand-hold positions on boxes during lifting. Where a lifter grabs the box can influence the trunk kinematics during the lifting task and these kinematics have been shown to provide some insight into risk of low back injury. This study documents the trunk postures and kinematics as a function of hand-hold position.
躯干运动学变量与举重过程中的下背部损伤风险有关，因此假设手握位置的变化可能会影响躯干运动学，从而影响风险。14 名受试者使用四个不同的手握位置（两个对称和两个不对称）提起一个 5 或 10 公斤的盒子，同时使用腰椎运动监测器（LMM）记录他们的躯干运动学（矢状面、冠状面和横断面的位置、速度和加速度）。然后，使用这些运动学数据来计算腰椎运动监测器风险评估模型中定义的高风险组概率（PHRGM）。结果表明，手握位置对躯干运动学有显著影响，导致 PHRGM 变量发生显著变化，从对称低负荷条件下的低 20%到不对称高负荷 10 公斤条件下的高 38%。
手动搬运工在搬运箱子时会使用各种手握位置。搬运者抓住箱子的位置会影响举重过程中的躯干运动学，这些运动学已经为理解下背部损伤风险提供了一些线索。本研究记录了手握位置的躯干姿势和运动学。
