Background: Occupational safety and health institutions report that caregivers areparticularly at risk of developing work-related musculoskeletal disorders (WRMSDs) andpatient handling is often pointed out as one of the main causes. While lots of studiesaddressed the use of assistive devices in order to protect caregivers, it seems that motorlessstand-up lifts have not been studied yet.Objectives: The aim of this work is to provide quantitative data about the loads in thelow back area, as well as qualitative data about subjects perceptions, resulting from the useof a motorless stand-up lift and to compare them to those resulting from manual patienthandling.Methods: Nine caregivers participated to motion capture and ground reaction forcesmeasurement sessions. These recordings were performed in three cases of handling:manual handling with one caregiver, manual handling with two caregivers, motorless deviceassisted handling. Forces and torques at the L5/S1 joint were then estimated throughInverse Dynamics process. A questionnaire about manual and motorless device assistedhandling was also submitted.Results: Motorless device assisted handling involved the smallest loads whereasmanual handling with one caregiver involved the biggest loads.Conclusions: Our findings suggest that, if the situation allows it, caregivers should behelped by another caregiver or use a motorless stand-up lift when handling a patient fromsitting to standing position or from standing to sitting position considering the reduced loadsthese aids involve.

翻译：背景：职业安全与健康机构报告指出，护理人员发生工作相关肌肉骨骼疾患（WRMSDs）的风险尤其突出，患者转运常被指认为主要致病因素之一。尽管已有大量研究关注使用辅助装置来保护护理人员，但无动力站立式升降机似乎尚未得到研究。目的：本研究旨在提供使用无动力站立式升降机时腰背区域负荷的定量数据以及受试者主观感受的定性数据，并将其与人工患者转运工况进行对比。方法：9名护理人员参与运动捕捉和地面反作用力测量实验。分别在三种转运工况下进行记录：单人人工转运、双人人工转运、无动力装置辅助转运。通过逆向动力学方法估算L5/S1关节受力和力矩。同时提交了关于人工与无动力装置辅助转运的问卷调查。结果：无动力装置辅助转运产生的负荷最小，而单人人工转运产生的负荷最大。结论：研究结果表明，在条件允许的情况下，护理人员在协助患者进行坐-站或站-坐体位转换时，应优先选择其他护理人员协助或使用无动力站立式升降机，因为这两种辅助方式均可显著降低负荷。