Analysis of the Effects of Treadmill Therapy Training on Sensorimotor Function in Spinal Cord Injured Rats Ira A. Fulton Schools of Engineering Center.

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Presentation transcript:

Analysis of the Effects of Treadmill Therapy Training on Sensorimotor Function in Spinal Cord Injured Rats Ira A. Fulton Schools of Engineering Center for Adaptive Neural Systems Arizona State University Tempe, AZ Jared Bartell, Mallika Fairchild, PhD, Ranu Jung, PhD Contact:

 250,000 people in the United States currently living with spinal cord injury (SCI) 1  52% paraplegia  47% quadraplegia  Estimated $9.7 billion each year  SCI population increasing 1 Spinal Cord Injury Facts & Statistics,

Complete SCI:  Paralysis below lesion  Disappearance of all motor and sensory control Incomplete SCI (iSCI):  Varying degrees of injury  Some sparing of supraspinal motor control and/or sensory functionality

 SCI treatment approaches available: o pharmacological intervention o stem cell impregnation o electrostimulation o REHABILITATION THERAPY  Similar physiological mechanisms involved in SCI support validity of rat model. Center for Adaptive Neural systems, ASU

Greater recovery to locomotion will be induced in iSCI rats receiving active treadmill training therapy compared to rats that do not receive therapy.

 Moderate-severe contusion induced on T9 Spinal cord level (thoracic vertebrae 8).  Four CCD cameras recorded animals’ performance. Peak Motus Motion Analysis System used to capture, digitize and process video. Treadmill Training |  Treadmill Training  | PRE-INJURY2 WPI3 WPI4 WPI5 WPI6 WPI graphicimages/bspine.gif

Pre-Injury  Pre-Injury data collected for all animals

2 Weeks Post-Injury  At 2wpi: 1/4 NT rats + 2/8 TT rats walked successfully

6 Weeks Post-Injury  At 6wpi: 2/4 NT rats + 8/8 TT rats walked successfully

Pre- Injury 2 WPI 6 WPI

Figure 8 pattern Cruciform variation Overextension By 6wpi, greater improvement in interlimb coordination for all joint angles in TT group, compared to NT group.

Swing and Stance Phase Durations and Footfall Pattern Over Time (4 cycles) Hindlimb (HL) and forelimb (FL) L: Left and R: Right. STANCE SWING TT Pre 1:1 NT 6wpi1:1 TT 6wpi 1:1 TT 6wpi 2:1 Stance/swing durations remain altered by 6wpi, however TT group with 2FL:1HL compensatory coordination shows greater improvement Normal gait pattern

 8/8 of the TT animals, as opposed to only 2/4 of the NT animals were able to successfully walk on the treadmill at 6 wpi.  Joint angles and footfall patterns showed altered stance and swing durations for the 6wpi animals, however the TT group showed greater improvement.  Intralimb coordination differences between NT and TT at 6wpi not significant.

 Use combinatorial therapies such as neuromuscular electrical stimulation along with treadmill therapy to improve recovery of sensorimotor function by targeting specific structural plasticity.  Compare / combine additional therapies for SCI.  Better understand recovery mechanisms.

Mallika Fairchild Center for Adaptive Neural Systems, Harrington Bioengineering, ASU Brian Hillen Center for Adaptive Neural Systems, Harrington Bioengineering, ASU Alex Iarkov, PhD Center for Adaptive Neural Systems, ASU Ronald Hammer, PhD Department of Psychology, ASU; U of A College of Medicine – Phoenix Ranu Jung, PhD Center for Adaptive Neural Systems, Harrington Bioengineering, ASU Supported by SFAZ CAA0282‐08. T HANK YOU !