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J Appl Physiol 94: 533-541, 2003. First published October 11, 2002; doi:10.1152/japplphysiol.00532.2002
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Vol. 94, Issue 2, 533-541, February 2003

Oxygen uptake kinetics during two bouts of heavy cycling separated by fatiguing sprint exercise in humans

N. Tordi1, S. Perrey3, A. Harvey2, and R. L. Hughson2

1 Laboratoire des Sciences du Sport, 25030 Besançon Cedex, France; 2 Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1; and 3 Faculté des Sciences du Sport, Unité de Formation et de Recherche en Sciences et Techniques des Activités Physiques et Sportives, 2991, 34090 Montpellier, France

We tested the hypothesis that O2 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 after prior sprint exercises but also 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 min and increased less after this after prior sprint exercise. Cardiac output, estimated by impedance cardiography, was significantly higher in the first 2 min of the second heavy exercise bout. Normalized integrated surface electromyography 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.

cardiac output; high-intensity cycling; muscle fatigue; electromyography


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