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Feasibility of closed-loop controller for righting seated posture after spinal cord injury

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. Aim Examine feasibility of sensor-based threshold controller to:

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Feasibility of closed-loop controller for righting seated posture after spinal cord injury

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  1. 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. 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. 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. 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. 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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