The Effects of a Passive Exoskeleton on Muscle Activity and Discomfort in Industrial Tasks

Abstract

Work-related musculoskeletal disorders (WMSD) have been progressively increasing. Specifically, Low back disorders (LBD) are the most predominant of all musculoskeletal disorders. In order to reduce the incidence of these problems, new auxiliary devices called exoskeletons have been introduced. This work provides a real context study of a back-support exoskeleton on industrial tasks in a furniture manufacturing company. The perception of eight participants regarding their experience with a passive back exoskeleton Laevo® was measured through a questionnaire that includes the assessment of perception of range of motion, reduction of backloading, interference with the task, overall physical effort, and discomfort. We also meresured the electromyography for the back muscles of five participants who performed an industrial task. Psychophysical results show that the exoskeleton gives back support. However, it also interferes with the execution of the task, limits movements, increases the overall effort and causes discomfort in the neck, shoulders, thoracic region, lumbar region and hips, and thighs. Electromyographic results show a decrease in muscle activity between 0.8 and 3.8% of the back muscles when wearing the exoskeleton. In conclusion, the exoskeleton used in this study does not seem appropriate for industrial tasks with a great diversity of movements.