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Aim

Effect of adjusting pulse durations of functional electrical stimulation cycling on energy expenditure and fatigue after spinal cord injury. Ashraf S. Gorgey, MPT, PhD, FACSM; Hunter J. Poarch, BS; David R. Dolbow, DPT, PhD; Teodoro Castillo, MD; David R. Gater, MD, PhD. Aim

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Aim

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  1. Effect of adjusting pulse durations of functional electrical stimulation cycling on energy expenditure and fatigue after spinal cord injury Ashraf S. Gorgey, MPT, PhD, FACSM; Hunter J. Poarch, BS; David R. Dolbow, DPT, PhD; Teodoro Castillo, MD; David R. Gater, MD, PhD

  2. Aim • Determine effects of different pulse durations on oxygen uptake (VO2), cycling performance, and energy expenditure (EE) of knee extensor muscles after cycling in persons with spinal cord injury (SCI). • Relevance • Will provide clinical basis for adjusting and manipulating functional electrical stimulation (FES) parameters to enhance performance and EE and minimize fatigue.

  3. Method • Repeated-measures design using FES cycle ergometer over 3 wk. • Convenience sample: • 10 individuals with motor complete SCI. • 3 different pulse durations: • 200, 350, and 500 s (P200, P350, and P500, respectively). • Measured immediately and 48–72 h after cycling.

  4. Results • Relative VO2 or cycling EE: • No difference among 3 FES protocols. • Delta EE between exercise and rest: • 42% greater in P500 and P350 compared with P200. • Muscle fatigue: • No difference among the three FES protocols. • Knee extensor torque: • Significant decreases immediately after and 48–72 h after FES leg cycling.

  5. Conclusion • Lengthening pulse duration did not affect submaximal or relative VO2 or EE, total EE, and time to fatigue. • Greater recovery VO2 and delta EE were noted in P350 and P500 compared with P200. • Acute bout of FES leg cycling resulted in torque reduction that did not fully recover 48–72 h after cycle.

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