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J Appl Physiol 38: 554-557, 1975;
8750-7587/75 $5.00
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Journal of Applied Physiology, Vol 38, Issue 3 554-557, Copyright © 1975 by American Physiological Society

ARTICLES

A sinusoidal load generator for use in cycle ergometry

P. F. Torres, B. J. Whipp, S. N. Steen and K. Wasserman

We have modified an electromagnetically braked cycle ergometer to provide a sinusoidally varying work load. This was accomplished by applying a low-frequency sinusoidal voltage at the inputs of the electromagnets using a sinusoidal potentiometer, whose shaft was driven by a variable-speed motor, and a voltage-programmable power supply to amplify the signal. The frequency range is currently 0.0017-0.3 Hz. This technique for sinusoidal work loads allow the period, amplitude, and mean position to be easily changed from a console, even during a test if required.




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