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Effect of prior multiple-sprint exercise on pulmonary O₂ uptake kinetics following the onset of perimaximal exercise

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 O_{2 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

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