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1 Department of Sport and Exercise Science, University of Wales, Aberystwyth, Aberystwyth, Ceredigion, United Kingdom
2 Chelsea School Research Centre, University of Brighton, Eastbourne, East Sussex, United Kingdom
3 Sport and Health Sciences, Exeter University, EXETER, United Kingdom
* To whom correspondence should be addressed. E-mail: mhb{at}aber.ac.uk.
Prior heavy exercise markedly alters the oxygen 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 5 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 recovery, P = 0.338), but increased the primary VO2 amplitude (from 2.42 ± 0.39 L.min-1 to 2.53 ± 0.41 L.min-1 after 10 min recovery, P = 0.001) and reduced the VO2 slow component (from 0.44 ± 0.13 L.min-1 to 0.21 ± 0.12 L.min-1 after 10 min 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] (to 5.1 ± 1.0 mM after 10 min recovery; P < 0.001). Baseline blood [lactate] 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.
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