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Articles in PresS, published online ahead of print October 11, 2002
J Appl Physiol, 10.1152/jap.00532.2002
Submitted on June 19, 2002
Accepted on October 2, 2002
1 Laboratoire des Sciences du Sport, University of Besancon, Besancon, France
2 Faculte des Sciences du Sport, University of Montpellier, Montpellier, France
3 Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada
* To whom correspondence should be addressed. E-mail: hughson{at}uwaterloo.ca.
We tested the hypothesis that oxygen uptake (VO2) kinetics at the onset of heavy exercise would be altered in a state of muscle fatigue and prior metabolic acidosis. Eight well-trained cyclists completed two identical bouts of 6-min cycling exercise at >85% of peak VO2 separated by three successive bouts of 30-s of sprint cycling. Not only was baseline VO2 elevated following prior sprint exercises but the time constant of phase II VO2 kinetics was faster (28.9±2.4 vs. 22.2±1.7 s, P<0.05). CO2 output (VCO2) was significantly reduced throughout the second exercise bout. Subsequently VO2 was greater at 3-minutes and increased less after this following prior sprint exercise. Cardiac output, estimated by impedance cardiography, was significantly higher in the first 2-minutes of the second heavy exercise bout. Normalized integrated surface electromyography (EMG) of four leg muscles and normalized mean power frequency were not different between exercise bouts. VO2 and VCO2 kinetic responses to heavy exercise were markedly altered by prior multiple sprint exercises.
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