External power output changes during prolonged cycling with electrical stimulation.
(2002) Journal of Rehabilitation Medicine — Vol. 34, n° 4, p. 171-175 (2002)
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- Abstract
- This study analysed external power output and physiologic responses in 5 individuals with paraplegia during 40 minutes of electrical stimulation leg cycle exercise. Cycling was performed on a motor-driven isokinetic ergometer that enabled precise determinations of power output. Electrical stimulation was increased to 120-140 mA within the first 5 minutes and remained constant thereafter. Power output increased to 10.7 +/- 3.0 W after 2 minutes, dropped to 5.3 +/- 1.8 W after 6 minutes and subsequently recovered to 8.2 +/- 2.2 and 6.1 +/- 2.3 W after 19.5 and 40 minutes, respectively. Oxygen consumption increased to 0.47 +/- 0.09 l/min after 6 minutes and declined during the second half of the exercise bout. Gross mechanical efficiency after 19.5 minutes was elevated compared with the value after 6 minutes. Heart rate was significantly increased at the end of the trial. The time-dependent variability of power output and physiological responses question the concept of steady state for this form of exercise.
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Citations
Theisen, D., Fornusek, C., Raymond, J., & Davis, G. M. (2002). External power output changes during prolonged cycling with electrical stimulation. Journal of Rehabilitation Medicine, 34(4), 171-175. https://doi.org/10.1080/16501970213238 (Original work published 2002)