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J Appl Physiol 97: 1227-1236, 2004. First published May 14, 2004; doi:10.1152/japplphysiol.01325.2003
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Effect of prior multiple-sprint exercise on pulmonary O2 uptake kinetics following the onset of perimaximal exercise

Daryl P. Wilkerson,1 Katrien Koppo,2 Thomas J. Barstow,3 and Andrew M. Jones1

1Department of Exercise and Sport Science, Manchester Metropolitan University, Alsager ST7 2HL, United Kingdom; 2Department of Movement and Sports Sciences, Ghent University, 9000 Ghent, Belgium; and 3Department of Kinesiology, Kansas State University, Manhattan, Kansas 66506

Submitted 10 December 2003 ; accepted in final form 12 May 2004

We hypothesized that the metabolic acidosis resulting from the performance of multiple-sprint exercise would enhance muscle perfusion and result in a speeding of pulmonary oxygen uptake (O2) kinetics during subsequent perimaximal-intensity constant work rate exercise, if O2 availability represented a limitation to O2 kinetics in the control (i.e., no prior exercise) condition. On two occasions, seven healthy subjects completed two bouts of exhaustive cycle exercise at a work rate corresponding to ~105% of the predetermined O2 peak, separated by 3 x 30-s maximal sprint cycling and 15-min recovery (MAX1 and MAX2). Blood lactate concentration (means ± SD: MAX1: 1.3 ± 0.4 mM vs. MAX2: 7.7 ± 0.9 mM; P < 0.01) was significantly greater immediately before, and heart rate was significantly greater both before and during, perimaximal exercise when it was preceded by multiple-sprint exercise. Near-infrared spectroscopy also indicated that muscle blood volume and oxygenation were enhanced when perimaximal exercise was preceded by multiple-sprint exercise. However, the time constant describing the primary component (i.e., phase II) increase in O2 was not significantly different between the two conditions (MAX1: 33.8 ± 5.5 s vs. MAX2: 33.2 ± 7.7 s). Rather, the asymptotic "gain" of the primary O2 response was significantly increased by the performance of prior sprint exercise (MAX1: 8.1 ± 0.9 ml·min–1·W–1 vs. MAX2: 9.0 ± 0.7 ml·min–1·W–1; P < 0.05), such that O2 was projecting to a higher "steady-state" amplitude with the same time constant. These data suggest that priming exercise, which apparently increases muscle O2 availability, does not influence the time constant of the primary-component O2 response but does increase the amplitude to which O2 may rise following the onset of perimaximal-intensity cycle exercise.

priming exercise; warm-up; respiratory gas exchange


Address for reprint requests and other correspondence: A. M. Jones, Dept. of Exercise and Sport Science, Manchester Metropolitan Univ., Hassall Rd., Alsager ST7 2HL, United Kingdom (E-mail: a.m.jones{at}mmu.ac.uk).




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