A computer simulation of free-range exercise in the laboratory.
Terblanche, E., J. A. Wessels, R. I. Stewart & J. H. Koeslag.
Department of Medical Physiology and Biochemistry, University of
Stellenbosch, P.O. Box 19063, Tygerberg, Cape Town, South Africa,
7505
APStracts 6:0271A, 1999.
We present a technique for simulating dynamic field (free-range)
exercise, using a novel computer-controlled cycle ergometer. This
modified cycle ergometer takes into account the effect of friction
and aerodynamic drag forces for a 70 kg cyclist in a racing position.
It also affords the ability of selecting different gear ratios. We
have used this technique to simulate a known competition cycle route
in Cape Town, South Africa. In an attempt to analyze the input
stimulus, in this case the generated power output of each cyclist, 8
subjects cycled for 40 minutes at a self-selected, comfortable pace
on the first part of the simulated route. Our results indicate that
this exercise input excites the musculo-cardiorespiratory system over
a wide range of power outputs, both in terms of amplitude and
frequency. This stimulus profile thereby complies with the
fundamental requirement for nonlinear (physiological) systems
analysis and identification. Through a computer simulation we have
devised a laboratory exercise protocol, which is not only
physiologically real, but also overcomes the artificiality of most
traditional laboratory exercise protocols.
Received 2 February 1998; accepted in final form 8 June 1999.
APS Manuscript Number A103-8.
Article publication pending Journal of Applied Physiology.
ISSN 1080-4757 Copyright 1999 The American Physiological Society.
Published in APStracts on 25 June 1999