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dc.contributor.authorSienko, Kathleen H
dc.contributor.authorBalkwill, M David
dc.contributor.authorWall, Conrad
dc.date.accessioned2013-04-22T14:11:50Z
dc.date.issued2012
dc.identifier.citationSienko, Kathleen H., M. David Balkwill, and Conrad Wall. 2012. Biofeedback improves postural control recovery from multi-axis discrete perturbations. Journal of NeuroEngineering and Rehabilitation 9:53.en_US
dc.identifier.issn1743-0003en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:10579117
dc.description.abstractBackground: Multi-axis vibrotactile feedback has been shown to significantly reduce the root-mean-square (RMS) sway, elliptical fits to sway trajectory area, and the time spent outside of the no feedback zone in individuals with vestibular deficits during continuous multidirectional support surface perturbations. The purpose of this study was to examine the effect of multidirectional vibrotactile biofeedback on postural stability during discrete multidirectional support surface perturbations. Methods: The vibrotactile biofeedback device mapped tilt estimates onto the torso using a 3-row by 16-column tactor array. The number of columns displayed was varied to determine the effect of spatial resolution upon subject response. Torso kinematics and center of pressure data were measured in six subjects with vestibular deficits. Transient and steady state postural responses with and without feedback were characterized in response to eight perturbation directions. Four feedback conditions in addition to the tactors off (no feedback) configuration were evaluated. Postural response data captured by both a force plate and an inertial measurement unit worn on the torso were partitioned into three distinct phases: ballistic, recovery, and steady state. Results: The results suggest that feedback has minimal effects during the ballistic phase (body’s outbound trajectory in response to the perturbation), and the greatest effects during the recovery (return toward baseline) and steady state (post-recovery) phases. Specifically, feedback significantly decreases the time required for the body tilt to return to baseline values and significantly increases the velocity of the body’s return to baseline values. Furthermore, feedback significantly decreases root mean square roll and pitch sway and significantly increases the amount of time spent in the no feedback zone. All four feedback conditions produced comparable performance improvements. Incidences of delayed and uncontrolled responses were significantly reduced with feedback while erroneous (sham) feedback resulted in poorer performance when compared with the no feedback condition. Conclusions: The results show that among the displays evaluated in this study, no one tactor column configuration was optimal for standing tasks involving discrete surface perturbations. Feedback produced larger effects on body tilt versus center of pressure parameters. Furthermore, the subjects’ performance worsened when erroneous feedback was provided, suggesting that vibrotactile stimulation applied to the torso is actively processed and acted upon rather than being responsible for simply triggering a stiffening response.en_US
dc.language.isoen_USen_US
dc.publisherBioMed Centralen_US
dc.relation.isversionofdoi:10.1186/1743-0003-9-53en_US
dc.relation.hasversionhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC3477042/pdf/en_US
dash.licenseLAA
dc.subjectVibrotactileen_US
dc.subjectBiofeedbacken_US
dc.subjectBalanceen_US
dc.subjectPerturbationsen_US
dc.subjectIntuitive displayen_US
dc.subjectSensory augmentationen_US
dc.subjectSensory substitutionen_US
dc.subjectVestibularen_US
dc.titleBiofeedback Improves Postural Control Recovery From Multi-Axis Discrete Perturbationsen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalJournal of NeuroEngineering and Rehabilitationen_US
dash.depositing.authorWall, Conrad
dc.date.available2013-04-22T14:11:50Z
dc.identifier.doi10.1186/1743-0003-9-53*
dash.contributor.affiliatedWall, Conrad


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