Trafimow Jordan, Aruin Alexander S
Department of Physical Therapy, University of Illinois at Chicago, Chicago, IL, USA.
Adv Orthop. 2018 Dec 2;2018:9164590. doi: 10.1155/2018/9164590. eCollection 2018.
Injury associated with lifting, especially low back injury, is a big problem in industry that accounts for loss of work and high medical expenses. Studies of biomechanics of lifting provide a basis for optimization of lifting. The aim of the study was to further investigate the role of the upward force due to negative acceleration during a lift.
Nine healthy subjects lifted an empty box and a box with additional load of 10, 20, and 25 lb. Kinematic data were recorded during the lifts and accelerations were calculated, and angular positions of the trunk and knee were obtained during the lifting when negative accelerations were used.
Negative acceleration assisted the quadriceps when the thighs were at approximately 90° and the hips when the trunk was rotating toward standing position. Negative acceleration was present during lifts of different loads.
The outcome of the study suggests that enhancing the use of negative acceleration could be a strategy to improve the quality of lifting and minimize a probability of low back injury.
与提举相关的损伤，尤其是下背部损伤，是工业领域中的一个大问题，会导致工作损失和高额医疗费用。提举生物力学研究为优化提举提供了依据。本研究的目的是进一步探究提举过程中负加速度产生的向上力的作用。
9名健康受试者分别提举一个空箱子以及额外负载为10磅、20磅和25磅的箱子。提举过程中记录运动学数据并计算加速度，在使用负加速度时获取提举过程中躯干和膝盖的角位置。
当大腿约呈90°时，负加速度辅助股四头肌发力；当躯干向站立位旋转时，负加速度辅助髋部发力。不同负载提举过程中均存在负加速度。
该研究结果表明，增加负加速度的利用可能是提高提举质量并降低下背部损伤概率的一种策略。
