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dc.contributor.authorYang, Feng
dc.contributor.authorBhatt, Tanvi
dc.contributor.authorPai, Yi-Chung
dc.date.accessioned2012-06-25T04:11:44Z
dc.date.available2012-06-25T04:11:44Z
dc.date.issued2011-10
dc.identifier.bibliographicCitationYang, F., Bhatt, T., & Pai, Y. C. 2011. Limits of recovery against slip-induced falls while walking. Journal of Biomechanics, 44(15): 2607-13. DOI: 10.1016/j.jbiomech.2011.08.018en
dc.identifier.issn0021-9290
dc.identifier.otherDOI: 10.1016/j.jbiomech.2011.08.018
dc.identifier.urihttp://hdl.handle.net/10027/8364
dc.descriptionNOTICE: 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, Vol 44, Issue 15, 13 October 2011. DOI: 10.1016/j.jbiomech.2011.08.018en
dc.description.abstractSlip-induced falls in gait often have devastating consequences. The purposes of this study were 1) to select the determinants that can best discriminate the outcomes (recoveries or falls) of an unannounced slip induced in gait (and to find their corresponding threshold, i.e., the limits of recovery, that can clearly separate these two outcomes), and 2) to verify these results in a subset of repeated slip trials. Based on the data collected from 69 young subjects during a slip induced in gait, nine different ways of combining the center of mass (COM) stability, the hip height, and its vertical velocity were investigated with the aid of logistic regression. The results revealed that the COM stability (s) and limb support (represented by the quotient of hip vertical velocity and hip height, Ship) recorded at the instant immediately prior to the recovery step touchdown were sufficiently sensitive to account for all (100%) variance in falls, and specific enough to account for nearly all (98.3%) variability in recoveries. This boundary (Ship = -0.22s -0.25), which quantifies the risk of falls in the stability-limb support quotient (s-Ship) domain, was fully verified using second-slip and third –slip trials (n = 76) with classification of falls at 100% and recoveries at 98.6%. The severity of an actual fall is likely to be greater further below the boundary, while the likelihood of a fall diminishes above it. Finally, the slope of the boundary also indicates the tradeoff between the stability and limb support, whereby high stability can compensate for the insufficiency in limb support, or vice versa.en
dc.description.sponsorshipThis work was funded by NIH 2RO1-AG16727 and RO1-AG029616.en
dc.language.isoen_USen
dc.publisherElsevieren
dc.subjectgait fall risken
dc.subjectfall preventionen
dc.subjectthresholden
dc.subjectlimb support quotienten
dc.subjectstabilityen
dc.titleLimits of Recovery Against Slip-Induced Falls While Walkingen
dc.typeArticleen


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