University of Limerick Institutional Repository

The effect of control strategies for an active back-support exoskeleton on spine loading and kinematics during lifting

DSpace Repository

Show simple item record Koopman, Axel S. Toxiri, Stefano Power, Valerie Kingma, Idsart van Dieën, Jaap H. Ortiz, Jesús de Looze, Michiel P. 2019-10-15T19:26:07Z 2019
dc.description peer-reviewed en_US
dc.description.abstract With mechanical loading as the main risk factor for LBP, exoskeletons (EXO) are designed to reduce the load on the back by taking over part of the moment normally generated by back muscles. The present study investigated the effect of an active exoskeleton, controlled using three different control modes (INCLINATION, EMG & HYBRID), on spinal compression forces during lifting with various techniques. Ten healthy male subjects lifted a 15 kg box, with three lifting techniques (free, squat & stoop), each of which was performed four times, once without EXO and once each with the three different control modes. Using inverse dynamics, we calculated L5/S1 joint moments. Subsequently, we estimated spine forces using an EMG-assisted trunk model. Peak compression forces substantially decreased by 17.8% when wearing the EXO compared to NO EXO. However, this reduction was partly, by about one third, attributable to a reduction of 25% in peak lifting speed when wearing the EXO. While subtle differences in back load patterns were seen between the three control modes, no differences in peak compression forces were found. In part, this may be related to limitations in the torque generating capacity of the EXO. Therefore, with the current limitations of the motors it was impossible to determine which of the control modes was best. Despite these limitations, the EXO still reduced both peak and cumulative compression forces by about 18%. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation SPEXOR en_US
dc.relation.ispartofseries Journal of Biomechanics;91, pp. 14-22
dc.rights This is the author’s version of a work that was accepted for publication in Journal of Biomechanics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Biomechanics, 2019, 91, pp. 14-22, en_US
dc.subject low-back pain en_US
dc.subject mechanical loading en_US
dc.subject active exoskeletons en_US
dc.subject compression forces and control en_US
dc.title The effect of control strategies for an active back-support exoskeleton on spine loading and kinematics during lifting en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1016/j.jbiomech.2019.04.044
dc.contributor.sponsor ERC en_US
dc.contributor.sponsor Italian Workers' Compensation Authority (INAIL) en_US
dc.relation.projectid 687662 en_US
dc.relation.projectid 608979 en_US
dc.relation.projectid 608022 en_US 2020-07-09
dc.embargo.terms 2020-07-09 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search ULIR


My Account