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Int J Sports Med 2002; 23(4): 262-267
DOI: 10.1055/s-2002-29080
Physiology and Biochemistry
© Georg Thieme Verlag Stuttgart · New York

The Decrease in the V˙O2 Slow Component Induced by Prior Exercise Does Not Affect the Time to Exhaustion

K.  Koppo1 , J.  Bouckaert1
  • 1Department of Movement and Sports Sciences, University of Ghent, Belgium
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Publication History



October 6, 2001

Publication Date:
14 May 2002 (online)

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Abstract

In previous studies decreases in the V˙O2 slow component were observed after prior heavy exercise. The observed effects after prior low-intensity exercise were rather controversial. The purpose of the present study was to more thoroughly examine the effects of prior low-intensity exercise on the V˙O2 slow component. Furthermore, it has been suggested that the V˙O2 slow component may be a determinant of exercise tolerance. Therefore we tested the hypothesis whether an attenuated V˙O2 slow component induced by prior exercise could affect the time to exhaustion. Ten subjects performed four exercise protocols consisting of heavy cycling exercise (95 % V˙O2peak) until exhaustion. This constant-load exercise was performed without prior exercise (protocol NPE), or was preceded by 6 min heavy cycling exercise (protocol 6HPE), 12 min low-intensity cycling exercise (protocol 12LPE) or 6 min low-intensity cycling exercise (protocol 6LPE). The V˙O2 slow component quantified as ΔV˙O2(end-2) (669 ± 90 ml × min-1 in NPE) was significantly reduced after heavy as well as low-intensity exercise (respectively 47 %, 29 % and 17 % in 6HPE, 12LPE and 6LPE). This reduction lead to a significantly lower end V˙O2 in 6HPE and 12LPE. The time to exhaustion (594 ± 139 s in NPE), however, was unaffected by prior exercise rejecting our hypothesis that the attenuated V˙O2 slow component could improve the capability to sustain exercise performance.

Key words

V˙O2 slow component - prior exercise - time to exhaustion

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J. Bouckaert

Department of Movement and Sports Sciences · University of Ghent

Watersportlaan 2 · 9000 Ghent · Belgium ·

Phone: +32 9 264 63 35

Fax: +32 9 264 64 84

Email: Jacques.Bouckaert@rug.ac.be

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