Effects of passive Arm-support exoskeleton on dynamic balance in different occupational tasks

This study investigates whether a passive arm-support exoskeleton (ASE) affects dynamic balance during various occupational tasks. Twenty healthy males performed six tasks under three conditions: without an exoskeleton (NoExo), with an exoskeleton but no supportive force (ExoForceOff), and with an exoskeleton providing supportive force (ExoForceOn). Balance and performance time were recorded using motion capture, and the effects of three conditions were evaluated using ANOVA. The results showed that the ASE's supportive force significantly improved the margin of stability and time to contact for lifting tasks, when comparing ExoForceOff to ExoForceOn. However, no significant balance effects were observed for the other four tasks, and performance time differences were significant only for lifting. These findings suggest that the exoskeleton's supportive force can enhance dynamic balance, but its effectiveness is task-specific. This study highlights the potential of passive ASEs to improve dynamic balance and reduce fall risks, depending on the occupational task type.