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dc.contributor.authorMcDonald, Kirsty A
dc.contributor.authorDevaprakash, Daniel
dc.contributor.authorRubenson, Jonas
dc.date.accessioned2020-08-21T04:28:17Z
dc.date.available2020-08-21T04:28:17Z
dc.date.issued2019
dc.identifier.issn0022-0949
dc.identifier.doi10.1242/jeb.195172
dc.identifier.urihttp://hdl.handle.net/10072/396640
dc.description.abstractCenter of mass (COM) control has been proposed to serve economy- and stability-related locomotor task objectives. However, given the lack of evidence supporting direct sensing and/or regulation of the COM, it remains unclear whether COM mechanics are prioritized in the control scheme of walking. We posit that peripheral musculoskeletal structures, e.g. muscle, are more realistic control targets than the COM, given their abundance of sensorimotor receptors and ability to influence whole-body energetics. As a first test of this hypothesis, we examined whether conservation of stance-phase joint mechanics is prioritized over COM mechanics in a locomotor task where simultaneous conservation of COM and joint mechanics is not feasible: imposed leg-length asymmetry. Positive joint mechanical cost of transport (work per distance traveled; COTJNT) was maintained at values closer to normal walking than COM mechanical cost of transport (COTCOM; P<0.05, N=15). Furthermore, compared with our measures of COM mechanics (COTCOM, COM displacement), joint-level variables (COTJNT, integrated total support moment) also displayed stronger conservation (less change from normal walking) when the participants' self-selected gait was assessed against other possible gait solutions. We conclude that when walking humans are exposed to an asymmetric leg-length perturbation, control of joint mechanics is prioritized over COM mechanics. Our results suggest that mechanical and metabolic effort is likely regulated via control of peripheral structures and not directly at the level of the COM. Joint mechanics may provide a more accurate representation of the underlying locomotor control targets and may prove advantageous in informing predictive models of human walking.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherCompany of Biologists Ltd.
dc.relation.ispartofissue9
dc.relation.ispartofjournalJournal of Experimental Biology
dc.relation.ispartofvolume222
dc.subject.fieldofresearchBiological sciences
dc.subject.fieldofresearchBiomedical and clinical sciences
dc.subject.fieldofresearchcode31
dc.subject.fieldofresearchcode32
dc.subject.keywordsScience & Technology
dc.subject.keywordsLife Sciences & Biomedicine
dc.subject.keywordsBiology
dc.subject.keywordsLife Sciences & Biomedicine - Other Topics
dc.subject.keywordsCost of transport
dc.titleIs conservation of center of mass mechanics a priority in human walking? Insights from leg-length asymmetry experiments
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationMcDonald, KA; Devaprakash, D; Rubenson, J, Is conservation of center of mass mechanics a priority in human walking? Insights from leg-length asymmetry experiments, Journal of Experimental Biology, 2019, 222 (9)
dcterms.dateAccepted2019-04-05
dc.date.updated2020-08-21T04:25:43Z
dc.description.versionVersion of Record (VoR)
gro.rights.copyright© 2019. Company of Biologists Ltd. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
gro.hasfulltextFull Text
gro.griffith.authorDevaprakash, Daniel


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