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J Appl Physiol 89: 1387-1396, 2000;
8750-7587/00 $5.00
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Vol. 89, Issue 4, 1387-1396, October 2000

Effects of prior heavy exercise on phase II pulmonary oxygen uptake kinetics during heavy exercise

Mark Burnley1, Andrew M. Jones2, Helen Carter3, and Jonathan H. Doust3

1 Chelsea School Research Centre, University of Brighton, Eastbourne, East Sussex, BN20 7SP; 2 Department of Exercise and Sport Science, Manchester Metropolitan University, Alsager, ST7 2HL; and 3 School of Sport, Exercise and Leisure, University of Surrey Roehampton, London, SW15 3SN, United Kingdom

We tested the hypothesis that heavy-exercise phase II oxygen uptake (VO2) kinetics could be speeded by prior heavy exercise. Ten subjects performed four protocols involving 6-min exercise bouts on a cycle ergometer separated by 6 min of recovery: 1) moderate followed by moderate exercise; 2) moderate followed by heavy exercise; 3) heavy followed by moderate exercise; and 4) heavy followed by heavy exercise. The VO2 responses were modeled using two (moderate exercise) or three (heavy exercise) independent exponential terms. Neither moderate- nor heavy-intensity exercise had an effect on the VO2 kinetic response to subsequent moderate exercise. Although heavy-intensity exercise significantly reduced the mean response time in the second heavy exercise bout (from 65.2 ± 4.1 to 47.0 ± 3.1 s; P < 0.05), it had no significant effect on either the amplitude or the time constant (from 23.9 ± 1.9 to 25.3 ± 2.9 s) of the VO2 response in phase II. Instead, this "speeding" was due to a significant reduction in the amplitude of the VO2 slow component. These results suggest phase II VO2 kinetics are not speeded by prior heavy exercise.

VO2 slow component; exercise transitions; lactate threshold; oxygen transport


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