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Impact of Pulse Durations on FES Cycling After SCI

Explore effects of different pulse durations on oxygen uptake, cycling performance, and energy expenditure post spinal cord injury. Results show varying recovery VO2 and delta EE. Findings support FES parameter adjustments for performance enhancement and fatigue reduction.

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Impact of Pulse Durations on FES Cycling After SCI

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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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