School of Kinesiology and Health Studies, Queen's University, Kingston, ON, Canada.
Ergonomics. 2011 Apr;54(4):392-402. doi: 10.1080/00140139.2011.556259.
The personal lift-assist device (PLAD) is a non-motorised, on-body device that acts as an external force generator using the concept of stored elastic energy. In this study, the effect of the PLAD on the lifting kinematics of male and female lifters was investigated using principal component analysis. Joint kinematic data of 15 males and 15 females were collected using an opto-electronic system during a freestyle, symmetrical-lifting protocol with and without wearing the PLAD. Of the 31 Principal Components (PCs) retained in the models, eight scores were significantly different between the PLAD and no-PLAD conditions. There were no main effects for gender and no significant interactions. Results indicated that the PLAD similarly affected the lifting kinematics of males and females; demonstrating significantly less lumbar and thoracic flexion and significantly greater hip and ankle flexion when wearing the PLAD. These findings add to the body of work that suggest the PLAD may be a safe and effective ergonomic aid. STATEMENT OF RELEVANCE: The PLAD is an ergonomic aid that has been shown to be effective at reducing low back demands during manual materials handling tasks. This body of work establishes that the PLAD encourages safe lifting practices without adversely affecting lifting technique.
个人助力提升装置（PLAD）是一种非动力的、贴身的设备，它利用储存的弹性势能作为外部力发生器。在这项研究中，使用主成分分析研究了 PLAD 对男性和女性举重者提升运动学的影响。使用光电系统收集了 15 名男性和 15 名女性在自由式、对称举重方案中的关节运动学数据，同时穿着和不穿着 PLAD。在保留的 31 个主成分（PC）中，有 8 个得分在 PLAD 和无 PLAD 条件之间存在显著差异。性别没有主效应，也没有显著的相互作用。结果表明，PLAD 对男性和女性的举重运动学有相似的影响；当佩戴 PLAD 时，腰椎和胸椎的弯曲明显减少，髋关节和踝关节的弯曲明显增加。这些发现增加了 PLAD 可能是一种安全有效的人体工程学辅助工具的工作依据。相关性声明：PLAD 是一种人体工程学辅助工具，已被证明在减少手动搬运任务中的腰部需求方面非常有效。这项工作表明，PLAD 鼓励安全的提升实践，而不会对提升技术产生不利影响。
