Floor slope effects on lifting kinematics and kinetics

描述(由申请人提供)：这是以前版本的 已提交R03建议书。这项研究计划的长期目标是 为搬运物体的手动材料搬运任务制定指南 从倾斜的地板表面，以减少腰痛的风险和 工作场所的伤害。具体目标包括确定起重能力 当面朝斜坡时，向下倾斜，并将其比作抬起 同一对象来自水平楼板表面。我们会作出更多努力，以 对提举的运动学和背部下部的负荷进行量化 为了了解不同的提升条件如何影响升降机，以及 如果一种提举情况使一个人受伤的风险增加 与其他情况相比，还将努力研究如何 不同的抬起技术(改变脚的位置)可能会降低这种可能性。 指由于在倾斜的表面上举起而引起的腰部疼痛或损伤。二 将使用单独的实验方案来实现 这项为期两年的研究计划的长期目标。第一个协议将 确定三种不同起重方式下的起重能力 脚相对于抬起的脚放在同一位置的情况 对象：朝上、朝下和在水平表面上。 将使用心理物理学的方法来确定每一个 条件。这种方法在过去曾被成功地用于确定 其他情况下的起重能力指南。此外，作为这一计划的一部分 礼仪、运动学、下背部负荷和肌肉 背部关键肌肉的活动将在每种情况下进行评估。 矢状面摄影将与人体测量参数相结合 对托举进行逆动力学分析。第二个协议将 以与第一个相同的方式进行。然而，脚的位置将是 在两个倾斜的提举中(一只脚向前一只脚)错开 在平坦的地面条件下，脚的放置将是均匀的。 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 意在制定有关倾斜表面吊装的指南。

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.