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Int J Sports Med 2001; 22(1): 21-26
DOI: 10.1055/s-2001-11335
Physiology and Biochemistry
Georg Thieme Verlag Stuttgart · New York

The Effect of Prior High-Intensity Cycling Exercise on the VšO2 Kinetics During High-Intensity Cycling Exercise is Situated at the Additional Slow Component

K. Koppo, J. Bouckaert
  • Department of Movement and Sports Sciences, University of Ghent, Belgium
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Publication History

Publication Date:
31 December 2001 (online)

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In previous studies conclusions about the effect of prior exercise on VšO2 kinetics of subsequent high-intensity exercise are generally based on observed changes in the overall VšO2 response without considering the effects on the VšO2 fast and slow component. The aim of the present study was to examine the effect on the VšO2 fast and slow component separately. Therefore 10 subjects performed an exercise protocol consisting of an initial 3 min period of unloaded cycling followed by two constant-load work bouts at a work rate corresponding to 90 % VšO2peak, separated by 3 min of rest and 3 min of unloaded cycling. VšO2 was measured on a breath-by-breath basis, and the response curves were analysed by a biexponential model. To increase signal-to-noise ratio, subjects performed four repetitions of the exercise protocol, each separated by at least one day. There was no significant alteration in VšO2 kinetic parameters of the primary, fast component after high-intensity exercise. However, there was a significant effect of prior high-intensity exercise on the VšO2 kinetic parameters of the slow component. The time constant and the amplitude of the slow component were reduced by respectively 44 % (from 231.0 ± 111.7 s to 130.1 ± 50.4 s) and 49 % (from 824 ± 270 ml · min--1 to 417 ± 134 ml · min--1). The results of this study indicate that the effect of high-intensity exercise on the VšO2 kinetics of a subsequent high-intensity exercise is probably limited to an effect on the slow component.

Key words:

Oxygen uptake kinetics, - biexponential model, - prior exercise.

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J.  Bouckaert

Department of Movement and Sports Sciences
University of Ghent

Watersportlaan 2

9000 Ghent

Belgium


Phone: Phone:+ 32 (9) 2646335

Fax: Fax:+ 32 (9) 2646484

Email: E-mail:Jacques.Bouckaert@rug.ac.be

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