Control of standing balance at leaning postures with functional neuromuscular stimulation following spinal cord injury.
This study systematically explored the potential of applying feedback control of functional neuromuscular stimulation (FNS) for stabilizing various erect and leaning standing postures after spinal cord injury (SCI). Perturbations ranging from 2 to 6% body weight were applied to two subjects with mot...
| Publicado en: | Medical & Biological Engineering & Computing Vol. 56; no. 2; pp. 317 - 331 |
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| Autores principales: | , , |
| Formato: | equations & formulas pictorial research tables/charts Journal Article |
| Publicado: |
Springer Nature
Feb2018
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=127735947&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 127735947 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 01400118 PO0 jtl: Medical & Biological Engineering & Computing issn: 01400118 maglogo: N pubinfo: dt: Feb2018 vid: 56 iid: 2 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 127735947 127735947 144180595 NLM28736791 127735947 10.1007/s11517-017-1687-x NLM28736791 127735947 ppf: 317 ppct: 14 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: Control of standing balance at leaning postures with functional neuromuscular stimulation following spinal cord injury. aug: au: Audu, Musa L. Odle, Brooke M. Triolo, Ronald J. affil: Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA sug: subj: Physical Therapy Spinal Cord Injuries Therapy Balance, Postural Torso Physiology Muscle, Skeletal Physiology Posture Physiology Middle Age Models, Theoretical Upper Extremity Physiology Female Activities of Daily Living Male Walkers Funding Source Human Middle Aged: 45-64 years Female Male ab: This study systematically explored the potential of applying feedback control of functional neuromuscular stimulation (FNS) for stabilizing various erect and leaning standing postures after spinal cord injury (SCI). Perturbations ranging from 2 to 6% body weight were applied to two subjects with motor complete thoracic level SCI who were proficient at standing with implanted multichannel neural stimulators to activate the ankle, knee, hip and trunk muscles. The subjects stood with four different postures: erect, forward, forward-right and forward-left. Repeatable and controlled perturbations were applied in the forward, backward, rightward and leftward directions by linear actuators pulling on ropes attached to the subjects via a belt worn just above the waist. Upper extremity (UE) forces exerted on a stationary walker were measured with load cells attached to the handles. A feedback controller based on center of pressure (CoP) varied the stimulation levels to the otherwise paralyzed muscles so as to resist the effects of the perturbations. The effect of the feedback controller was compared to the case where only open-loop baseline stimulation was applied. This was done in terms of: (a) maximum resultant UE force exerted by the subjects on the walker, (b) maximum resultant CoP overshoot and (c) CoP root-mean-square deviation (RMSD). Feedback control resulted in significant reductions in the mean values of the majority of outcome values compared to baseline open-loop stimulation. Maximum resultant UE force was reduced by as much as 50% in one of the postures for one of the subjects. RMSD and maximum CoPs were reduced by as much as 75 and 70%, respectively, with feedback control. These results indicate that feedback control can be used to reject destabilizing disturbances in individuals with SCI using FNS not only for erect postures but also for leaning postures typically adopted during reaching while attempting various activities of daily living. pubtype: Academic Journal doctype: equations & formulas pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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