Floor slope effects on lifting kinematics and kinetics

描述（由申请人提供）：这是对先前 R03提案这项研究计划的长期目标是 为提升物体的人工物料搬运任务制定指导方针 从倾斜的地板表面，以减少腰痛的风险， 在工作场所受伤。具体目标包括确定起重能力 而面对着一个斜坡，下一个斜坡，并比较他们举起 同一物体从水平地板表面。将作出更多努力， 量化提升的运动学以及下背部的负荷， 为了了解不同的起重条件如何影响起重机，以及 如果一种提升条件使人处于增加的受伤风险中， 与其他条件相比，还将努力研究如何 不同的提升技术（改变脚的位置）可能会降低 在倾斜的表面上提起引起的腰痛或受伤。两 将使用单独的实验方案以实现 这是两年研究计划的长期目标。第一个协议将 在三种不同的起重方式下确定起重能力 脚相对于被举物放置在相同位置的情况 物体：面向斜坡上方、面向斜坡下方和在水平面上。 心理物理学方法将用于确定每个人的提升能力。 条件这种方法在过去已成功地用于确定 其他情况下的起重能力指南。此外，作为其中的一部分， 协议，运动学，下背部的负荷和肌肉 在每种情况下，将评估背部关键肌肉的活动。 超平面电影摄影将与人体测量学参数相结合 对电梯进行逆动力学分析第二个协议将 以与第一次相同的方式进行。然而，脚的位置将是 在两个倾斜的升降机中交错（一只脚在另一只脚的前面） 当脚放置在水平表面条件下时， 参与者数量将允许对男性、女性和 整个团队。这两个方案的结果将与 意图制定与倾斜表面上的提升相关的指南。

DESCRIPTION (provided by applicant): This is a revision of a previously submitted R03 proposal. The long-term objective of this research program is to develop guidelines for the Manual Materials Handling task of lifting an object from an inclined floor surface in order to reduce the risk of low-back pain and injury at the workplace. Specific aims include determining lifting capacities while facing up an incline, down an incline, and compare them to lifting the same object from a level floor surface. Additional efforts will be made to quantify the kinematics of lifting as well as the loading on the low back in order to understand how the different lifting conditions affect the lifter, and if one lifting condition places a person at an increased risk of injury compared to other conditions, Efforts will also be made to examine how different lifting techniques (altered foot placement) may reduce the likelihood of low-back pain or injury caused from lifting on an inclined surface. Two separate experimental protocols will be utilized in order to realize the long-term objectives of this two-year research program. The first protocol will determine lifting capacities under three distinctly different lifting situations with the feet placed in the same position relative to the lifted object: facing up an incline, facing down an incline, and on a level surface. The psychophysical method will be used to determine lifting capacities in each condition. This method has been used successfully in the past to determine lifting capacity guidelines for other situations. Also, as part of this protocol, kinematics of motion, the loading on the lower back, and muscle activity of key muscles in the back will be assessed in each condition. Sagittal plane cinematography will be combined with anthropometrics parameters to perform an inverse-dynamics analysis of the lifts. The second protocol will be conducted in the same manner as the first. However, foot placement will be staggered (one foot forward of the other) in the two inclined lifting situations while foot placement will be even in the level surface condition. Participant numbers will allow statistical comparisons of males, females, and the whole group. The results from these two protocols will be combined with the intent to produce guidelines related to lifting on inclined surfaces.