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Paradigms of Lower Extremity Electrical Stimulation Training After Spinal Cord Injury
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Published on: February 1, 2018

Development of an isokinetic functional electrical stimulation cycle ergometer.

Ché Fornusek1, Glen M Davis, Peter J Sinclair

  • 1Rehabilitation Research Center and School of Exercise and Sports Science, Faculty of Health Sciences, University of Sydney, and Graduate School of Biomedical Engineering, University of New South Wales, Sydney, Australia.

Neuromodulation : Journal of the International Neuromodulation Society
|December 14, 2011
PubMed
Summary

A new isokinetic functional electrical stimulation leg cycle ergometer (iFES-LCE) allows spinal cord injury (SCI) patients to train at various cadences. This device enhances muscular strength and cardiorespiratory fitness, offering improved training potential.

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Area of Science:

  • Rehabilitation Engineering
  • Biomedical Engineering
  • Neuroscience

Background:

  • Spinal cord injury (SCI) often leads to significant motor and cardiorespiratory deficits.
  • Traditional exercise equipment may not be suitable for individuals with SCI.
  • Functional electrical stimulation (FES) offers a potential method for muscle activation and exercise in SCI populations.

Purpose of the Study:

  • To develop and evaluate an isokinetic functional electrical stimulation leg cycle ergometer (iFES-LCE).
  • To enable cycle training across a wide range of pedaling cadences (5-60 rev/min) for individuals with SCI.
  • To assess the device's performance characteristics and accuracy for promoting muscular strength and cardiorespiratory fitness.

Main Methods:

  • Integration of a commercial motorized cycle ergometer with a custom FES system, laptop, and specialized chair.
  • Collection of biomechanical data from an SCI subject during FES cycling.
  • Calibration of the iFES-LCE system to establish relationships between torque and motor current.
  • Comparison of iFES-LCE motor torque data with strain-gauge instrumented pedals.

Main Results:

  • The iFES-LCE demonstrated a linear relationship between applied torque and braking motor current for velocity maintenance.
  • Performance data from the iFES-LCE closely correlated with data from strain-gauge instrumented pedals (r=0.93-0.98).
  • The system performed effectively across a range of pedaling cadences, including low cadences.

Conclusions:

  • The novel iFES-LCE system provides enhanced training potential for individuals with SCI.
  • The device facilitates cycling across a broad range of cadences, particularly beneficial for low-cadence training.
  • The iFES-LCE improves ergometer accuracy by accounting for the passive load of the legs, offering a more precise training tool.