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External power output changes during prolonged cycling with electrical stimulation.

D Theisen1, C Fornusek, J Raymond

  • 1Department of Physical Education and Rehabilitation, Faculty of Medicine, Catholic University of Louvain, Louvain-la-Neuve, Belgium. daniel.theisen@edph.ucl.ac.be

Journal of Rehabilitation Medicine
|August 31, 2002
PubMed
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Electrical stimulation leg cycle exercise in individuals with paraplegia shows variable power output and physiological responses, challenging the notion of a steady state during this activity.

Area of Science:

  • Exercise Physiology
  • Rehabilitation Medicine
  • Biomedical Engineering

Background:

  • Individuals with paraplegia often experience reduced physical activity.
  • Electrical stimulation leg cycle exercise (ESLCE) offers a potential avenue for physical activity and rehabilitation.
  • Understanding the physiological responses during ESLCE is crucial for optimizing training protocols.

Purpose of the Study:

  • To analyze external power output and physiological responses during 40 minutes of ESLCE in individuals with paraplegia.
  • To investigate the variability of power output and physiological parameters over time.
  • To assess whether a steady state is achieved during ESLCE.

Main Methods:

  • Five individuals with paraplegia performed 40 minutes of ESLCE on a motor-driven isokinetic ergometer.

Related Experiment Videos

  • Electrical stimulation intensity was gradually increased to 120-140 mA and maintained.
  • Power output, oxygen consumption, and heart rate were measured throughout the exercise bout.

    • Main Results:

    • Power output exhibited initial increase, followed by a decline, and subsequent partial recovery.
    • Oxygen consumption rose early in the exercise and decreased in the latter half.
    • Gross mechanical efficiency improved over time, and heart rate significantly increased by the end of the trial.

    Conclusions:

    • ESLCE elicits variable power output and physiological responses in individuals with paraplegia.
    • The findings question the assumption of a steady state during prolonged ESLCE.
    • Further research is needed to optimize ESLCE protocols for individuals with spinal cord injury.