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Sina Askari, MS; TeKang Chao; Ray D. de Leon, PhD; Deborah S. Won, PhD

The effect of timing electrical stimulation to robotic-assisted stepping on neuromuscular activity and associated kinematics. Sina Askari, MS; TeKang Chao; Ray D. de Leon, PhD; Deborah S. Won, PhD. Aim

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Sina Askari, MS; TeKang Chao; Ray D. de Leon, PhD; Deborah S. Won, PhD

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  1. The effect of timing electrical stimulation to robotic-assisted stepping on neuromuscular activity and associated kinematics Sina Askari, MS; TeKang Chao; Ray D. de Leon, PhD; Deborah S. Won, PhD

  2. Aim • Determine how timing neuromuscular functional electrical stimulation (FES) to limb movements during stepping might alter neuromuscular control differently than patterned stimulation alone. • Relevance • FES has been used to strengthen muscles weakened by neurological damage and artificially replace muscle activation missing because of spinal cord injury (SCI).

  3. Method • Developed prototype FES system for rodent SCI model that timed FES to robotic treadmill training (RTT) for 2 rat groups: • FES+RTT • FES+RTT and tibialis anterior (TA) stimulation timed according to robot-controlled hind-limb position. • Randomly timed stimulation (RS) • Similarly patterned stimulation, randomly timed with respect to hind-limb movements, while in cages. • Tested treadmill stepping ability and compared hind-limb movement and TA electromyography (EMG) activity after 4 wk.

  4. Results • FES+RTT group stepped faster and exhibited TA EMG profiles that better matched applied stimulation profile during training than RS group.

  5. Conclusion • Locomotor training consisting of FES timed to hind-limb movement improved activation of hind-limb muscle more so than RS alone.

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