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This article and any supplementary material should be cited as follows: Murphy JO, Audu ML, Lombardo LM, Foglyano KM, Triolo RJ. Feasibility of closed-loop.

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Presentation on theme: "This article and any supplementary material should be cited as follows: Murphy JO, Audu ML, Lombardo LM, Foglyano KM, Triolo RJ. Feasibility of closed-loop."— Presentation transcript:

1 This article and any supplementary material should be cited as follows: Murphy JO, Audu ML, Lombardo LM, Foglyano KM, Triolo RJ. Feasibility of closed-loop controller for righting seated posture after spinal cord injury. J Rehabil Res Dev. 2014;51(5):747–60. http://dx.doi.org/10.1682/JRRD.2013.09.0200 Slideshow Project DOI:10.1682/JRRD.2013.09.0200JSP Feasibility of closed-loop controller for righting seated posture after spinal cord injury Julie O. Murphy, BSE; Musa L. Audu, PhD; Lisa M. Lombardo, MPT; Kevin M. Foglyano, BSE; Ronald J. Triolo, PhD

2 This article and any supplementary material should be cited as follows: Murphy JO, Audu ML, Lombardo LM, Foglyano KM, Triolo RJ. Feasibility of closed-loop controller for righting seated posture after spinal cord injury. J Rehabil Res Dev. 2014;51(5):747–60. http://dx.doi.org/10.1682/JRRD.2013.09.0200 Slideshow Project DOI:10.1682/JRRD.2013.09.0200JSP Aim – Examine feasibility of sensor-based threshold controller to: Automatically modulate stimulation to paralyzed hip and trunk extensor muscles. Restore upright sitting from forward leaning postures. Relevance – Spinal cord injury (SCI) can compromise ability to maintain erect seated posture.

3 This article and any supplementary material should be cited as follows: Murphy JO, Audu ML, Lombardo LM, Foglyano KM, Triolo RJ. Feasibility of closed-loop controller for righting seated posture after spinal cord injury. J Rehabil Res Dev. 2014;51(5):747–60. http://dx.doi.org/10.1682/JRRD.2013.09.0200 Slideshow Project DOI:10.1682/JRRD.2013.09.0200JSP Method 5 volunteers with SCI. Forward trunk tilt was estimated from anterior- posterior component of gravitational acceleration sensed by sternum-mounted wireless accelerometer. Stimulation: – Increased if trunk tilt exceeded specified flexion threshold. – Ceased once upright sitting was resumed.

4 This article and any supplementary material should be cited as follows: Murphy JO, Audu ML, Lombardo LM, Foglyano KM, Triolo RJ. Feasibility of closed-loop controller for righting seated posture after spinal cord injury. J Rehabil Res Dev. 2014;51(5):747–60. http://dx.doi.org/10.1682/JRRD.2013.09.0200 Slideshow Project DOI:10.1682/JRRD.2013.09.0200JSP Results Controller successfully returned all subjects to upright postures from forward leaning positions. Upper-limb effort exerted while returning to erect posture was significantly reduced across all volunteers while using controller (vs continuous and no stimulation). Controller response times were consistent among subjects when applied while sitting with or without backrest. Controller enabled volunteers to lean farther forward in wheelchairs without upper-limb effort than with no stimulation.

5 This article and any supplementary material should be cited as follows: Murphy JO, Audu ML, Lombardo LM, Foglyano KM, Triolo RJ. Feasibility of closed-loop controller for righting seated posture after spinal cord injury. J Rehabil Res Dev. 2014;51(5):747–60. http://dx.doi.org/10.1682/JRRD.2013.09.0200 Slideshow Project DOI:10.1682/JRRD.2013.09.0200JSP Conclusion A simple threshold-based trunk tilt controller can modulate stimulation of trunk and hip extensor muscles of individuals with SCI to restore seated posture during forward fall. Future studies should determine clinical utility of system for facilitating reach or preventing falls.

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