Wearing a back-support exoskeleton alters lower-limb joint kinetics during single-step recovery following a forward loss of balance

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dc.contributor.authorPark, Jang-Hoen
dc.contributor.authorMadigan, Michael L.en
dc.contributor.authorKim, Sunwooken
dc.contributor.authorNussbaum, Maury A.en
dc.contributor.authorSrinivasan, Divyaen
dc.date.accessioned2024-04-09T12:28:13Zen
dc.date.available2024-04-09T12:28:13Zen
dc.date.issued2024-03-31en
dc.description.abstractWe assessed the effects of a passive, back-support exoskeleton (BSE) on lower-limb joint kinetics during the initiation and swing phases of recovery from a forward loss of balance. Sixteen (8M, 8F) young, healthy participants were released from static forward-leaning postures and attempted to recover their balance with a single-step while wearing a BSE (backX<sup>TM</sup>) with different levels of support torque and in a control condition. The BSE provided ∼ 15-20 Nm of external hip extension torque on the stepping leg at the end of initiation and beginning of swing phases. Participants were unable to generate sufficient hip flexion torque, power, and work to counteract this external torque, although they sustained hip flexion torque for a more prolonged period, resulting in slightly increased hip contribution to positive leg work (compared to control). However, net positive leg work, and the net contribution of hip joint (human + BSE) to total leg work decreased with BSE use. While all participants had changes in hip joint kinetics, a significant compensatory increase in ankle contribution to positive leg work was observed only among females. Our results suggest that BSE use adversely affects reactive stepping by decreasing the stepping leg kinetic energy for forward propulsion, and that the relative contributions of lower-limb joints to total mechanical work done during balance recovery are altered by BSE use. BSEs may thus need to be implemented with caution for dynamic tasks in occupational settings, as they may impair balance recovery following a forward loss of balance.en
dc.description.versionAccepted versionen
dc.format.mimetypeapplication/pdfen
dc.identifier112069 (Article number)en
dc.identifier.doihttps://doi.org/10.1016/j.jbiomech.2024.112069en
dc.identifier.eissn1873-2380en
dc.identifier.issn0021-9290en
dc.identifier.orcidNussbaum, Maury [0000-0002-1887-8431]en
dc.identifier.otherS0021-9290(24)00146-5 (PII)en
dc.identifier.pmid38579560en
dc.identifier.urihttps://hdl.handle.net/10919/118513en
dc.identifier.volume166en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urihttps://www.ncbi.nlm.nih.gov/pubmed/38579560en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectFallsen
dc.subjectMuscle poweren
dc.subjectOccupational exoskeletonen
dc.subjectReactive steppingen
dc.titleWearing a back-support exoskeleton alters lower-limb joint kinetics during single-step recovery following a forward loss of balanceen
dc.title.serialJournal of Biomechanicsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherJournal Articleen
dcterms.dateAccepted2024-03-30en
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Engineeringen
pubs.organisational-group/Virginia Tech/Engineering/Industrial and Systems Engineeringen
pubs.organisational-group/Virginia Tech/Faculty of Health Sciencesen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Engineering/COE T&R Facultyen

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