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Evaluation of patterned stimulation for use in surface functional electrical stimulation systems

N Mourselas1, M H Granat

  • 1Bioengineering Unit, Wolfson Centre, University of Strathclyde, Glasgow, Scotland, UK.

Medical Engineering & Physics
|October 17, 1998
PubMed
Summary

Variable frequency pulse trains (VFT) do not significantly alleviate muscle fatigue in functional electrical stimulation. While VFTs show a slight increase in muscle output, this benefit is minimal and diminishes at higher stimulation intensities.

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Area of Science:

  • Rehabilitation Engineering
  • Neuroscience
  • Muscle Physiology

Background:

  • Muscle fatigue limits functional electrical stimulation (FES) for individuals with neurological deficits.
  • Variable frequency pulse trains (VFT) are proposed to improve muscle efficiency over constant frequency trains (CFT).

Purpose of the Study:

  • To investigate the efficacy of VFTs in improving muscle output and alleviating fatigue compared to CFTs.
  • To determine the optimal parameters for VFTs, specifically inter-pulse intervals.

Main Methods:

  • Experiments conducted on fifteen non-impaired and one spinal cord injured subject.
  • Comparison of muscle output between VFT and CFT delivering equivalent electrical energy.
  • Analysis of the effect of stimulation intensity on VFT performance.

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Main Results:

  • VFTs produced a relative increase in muscle output compared to CFTs at the same energy level.
  • Optimal performance observed with VFTs using doublets with a 5 ms inter-pulse interval.
  • The benefits of VFTs diminished significantly at higher stimulation intensities.

Conclusions:

  • Observed improvements in muscle output with VFTs are likely due to altered motor unit recruitment, not intrinsic muscle properties.
  • VFTs offer minimal practical benefit for alleviating muscle fatigue in functional electrical stimulation systems.