| Sumario: | Purpose A variety of transfer devices are developed to provide convenience to caregivers (Lee et al., 2020). Although there are many types of transfer devices, caregivers experience a physical burden when handling them. This study aims to analyze the physical burden through EMG measurement and Rapid Entire Body Assessment (REBA) when using three types of transfer devices, including a transfer device with robot technology. Method Five caregivers (four social workers and one occupational therapist) performed a bed-to-wheelchair and wheelchair-to-bed transfer using three transfer devices: a dual-arm assistive robotic transfer device, a mobile hoist, and a ceiling hoist. During the transfer operation, Caregivers' EMG signals were collected. Six EMG sensors were attached to the bilateral upper trapezius muscles (RTRP, LTRP) and upper/lower erector spinae muscles (RUES, LUES, RLES, LLES), respectively. For data analysis, video and EMG signals were synchronized using an inertial measurement device. The muscle activity from EMG signals was analyzed using reference voluntary contraction. By using REBA, caregivers' posture was evaluated for each subtask. Results and Discussion The physical burden was different for each subtask through EMG and REBA analysis while using the transfer devices (Table 1). The subtasks of setting and removing the sling from the bed had the highest biomechanical loads in all transfer devices. Compared to other devices, the dual-arm assistive robotic transfer device had higher REBA scores in the subtask of fastening (9.6±1.5) and unfastening (9.4±1.5) the sling and the transfer device in the wheelchair. Improvements and training are needed on how to set up and remove the sling and how to attach the sling to a transfer device. This study can be utilized for the development of a useful robotic transfer device. In future research, it is necessary to improve usability when using multiple devices simultaneously under various conditions and environments.
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