Journal of Applied Physiology
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J Appl Physiol 101: 1320-1327, 2006. First published July 20, 2006; doi:10.1152/japplphysiol.00475.2006
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Time required for the restoration of normal heavy exercise VO2 kinetics following prior heavy exercise

Mark Burnley,1 Jonathan H. Doust,2 and Andrew M. Jones3

1Department of Sport and Exercise Science, University of Wales, Aberystwyth, Ceredigion; 2Chelsea School Research Centre, University of Brighton, Eastbourne, East Sussex; and 3School of Sport and Health Sciences, University of Exeter, Devon, United Kingdom

Submitted 26 April 2006 ; accepted in final form 7 July 2006

Prior heavy exercise markedly alters the O2 uptake (VO2) response to subsequent heavy exercise. However, the time required for VO2 to return to its normal profile following prior heavy exercise is not known. Therefore, we examined the VO2 responses to repeated bouts of heavy exercise separated by five different recovery durations. On separate occasions, nine male subjects completed two 6-min bouts of heavy cycle exercise separated by 10, 20, 30, 45, or 60 min of passive recovery. The second-by-second VO2 responses were modeled using nonlinear regression. Prior heavy exercise had no effect on the primary VO2 time constant (from 25.9 ± 4.7 s to 23.9 ± 8.8 s after 10 min of recovery; P = 0.338), but it increased the primary VO2 amplitude (from 2.42 ± 0.39 to 2.53 ± 0.41 l/min after 10 min of recovery; P = 0.001) and reduced the VO2 slow component (from 0.44 ± 0.13 to 0.21 ± 0.12 l/min after 10 min of recovery; P < 0.001). The increased primary amplitude was also evident after 20–45 min, but not after 60 min, of recovery. The increase in the primary VO2 amplitude was accompanied by an increased baseline blood lactate concentration (to 5.1 ± 1.0 mM after 10 min of recovery; P < 0.001). Baseline blood lactate concentration was still elevated after 20–60 min of recovery. The priming effect of prior heavy exercise on the VO2 response persists for at least 45 min, although the mechanism underpinning the effect remains obscure.

priming exercise; lactate; oxygen uptake slow component


Address for reprint requests and other correspondence: M. Burnley, Dept. of Sport and Exercise Science, Carwyn James Bldg., Univ. of Wales, Aberystwyth, Aberystwyth, Ceredigion SY23 3FD, UK (e-mail: mhb{at}aber.ac.uk)






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