Biomechanical assessment of two back-support exoskeletons in symmetric and asymmetric repetitive lifting with moderate postural demands.

Applied Ergonomics
Saman MadineiMaury A Nussbaum

Abstract

Two passive back-support exoskeleton (BSE) designs were assessed in terms of muscular activity, energy expenditure, joint kinematics, and subjective responses. Eighteen participants (gender-balanced) completed repetitive lifting tasks in nine different conditions, involving symmetric and asymmetric postures and using two BSEs (along with no BSE as a control condition). Wearing both BSEs significantly reduced peak levels of trunk extensor muscle activity (by ~9-20%) and reduced energy expenditure (by ~8-14%). Such reductions, though, were more pronounced in the symmetric conditions and differed between the two BSEs tested. Participants reported lower perceived exertion using either BSE yet raised concerns regarding localized discomfort. Minimal changes in lifting behaviors were evident when using either BSE, and use of both BSEs led to generally positive usability ratings. While these results are promising regarding the occupational use of BSEs, future work is recommended to consider inter-individual differences to accommodate diverse user needs and preferences.

Citations

Mar 28, 2021·Journal of Biomechanics·Athulya A SimonAlan T Asbeck
Aug 8, 2021·International Journal of Environmental Research and Public Health·Mathilde SchwartzKévin Desbrosses
Aug 21, 2021·Ergonomics·Niclas HoffmannRobert Weidner
Oct 6, 2021·International Journal of Occupational Safety and Ergonomics : JOSE·Unai Latorre ErezumaAna Rodriguez-Larrad

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