Experimental Evaluation of a Shoulder-Support Exoskeleton for Overhead Work: Influences of Peak Torque Amplitude, Task, and Tool Mass

OCCUPATIONAL APPLICATIONSIn this study, we explored the effects of peak torque amplitude (PTA) provided from a passive shoulder-support exoskeleton (shoulderX) on muscle activation, preference, and perceived exertion. Use of the exoskeleton during both sustained and repetitive overhead tasks reduced bilateral shoulder flexor muscle activity with increasing levels of PTA. Muscle activation was reduced by up to 81%, and participants reported reduced perceived exertion when wearing the device compared to an unassisted condition. Use of the exoskeleton was preferred by all participants, versus an unassisted condition, though the preferred level of PTA varied across participants. In occupational use, a properly chosen support level may help reduce the risk of injury associated with performing overhead tasks.