Exploration of different classes of metrics to characterize motor variability during repetitive symmetric and asymmetric lifting tasks

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dc.contributor.authorSedighi, Alirezaen
dc.contributor.authorNussbaum, Maury A.en
dc.contributor.departmentIndustrial and Systems Engineeringen
dc.date.accessioned2019-07-23T16:50:04Zen
dc.date.available2019-07-23T16:50:04Zen
dc.date.issued2019-07-08en
dc.description.abstractThe substantial kinematic degrees-of-freedom available in human movement lead to inherent variations in a repetitive movement, or motor variability (MV). Growing evidence suggests that characterizing MV permits a better understanding of potential injury mechanisms. Several diverse methods, though, have been used to quantify MV, but limited evidence exists regarding the merits of these methods in the occupational context. In this work, we explored different classes of methods for characterizing MV during symmetric and asymmetric box lifting tasks. Kinematic MV of both the whole-body center-of-mass (COM) and the box were quantified, using metrics derived from a linear method (Standard Deviation), a non-linear method (Sample Entropy; an index of movement regularity), and a novel application of an equifinality method (Goal Equivalent Manifold; an index related to the set of effective motor solutions). Our results suggest that individuals manipulate regularity and the set of effective motor solutions to overcome unwanted motor noises related to the COM. These results, together with earlier evidence, imply that individuals may prioritize stability over variability with increasing task difficulty. Task performance also appeared to deteriorate with decreasing variability and regularity of the COM. We conclude that diverse metrics of MV may be complimentary to reveal differences in MV.en
dc.description.notesThe first author was supported by a pre-doctoral training program grant (T03 OH008613) from the U.S. Centers for Disease Control and Prevention. The contents of this work are solely the responsibility of the authors and do not necessarily represent the official views of the Centers for Disease Control and Prevention or the Department of Health and Human Services.en
dc.description.sponsorshipU.S. Centers for Disease Control and Prevention [T03 OH008613]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1038/s41598-019-46297-3en
dc.identifier.issn2045-2322en
dc.identifier.other9821en
dc.identifier.pmid31285469en
dc.identifier.urihttp://hdl.handle.net/10919/91920en
dc.identifier.volume9en
dc.language.isoenen
dc.publisherSpringer Natureen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectlow-back-painen
dc.subjectmovement variabilityen
dc.subjectsample entropyen
dc.subjecttorso kinematics/kineticsen
dc.subjectapproximate entropyen
dc.subjectexperienced workersen
dc.subjecthealthyen
dc.subjectPerformanceen
dc.subjectstrategiesen
dc.subjectdisordersen
dc.titleExploration of different classes of metrics to characterize motor variability during repetitive symmetric and asymmetric lifting tasksen
dc.title.serialScientific Reportsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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