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1 Sport and Health Sciences, Exeter University, EXETER, United Kingdom
2 School of Sport and Health Sciences, University of Exeter, St. Luke's Campus, Exeter, United Kingdom
3 School of Sport and Health Sciences, University of Exeter, Exeter, Devon, United Kingdom
* To whom correspondence should be addressed. E-mail: a.m.jones{at}exeter.ac.uk.
We hypothesized that the performance of prior heavy exercise would speed the Phase II kinetics during subsequent heavy exercise in the supine position (where perfusion pressure might limit muscle O2 supply) but not in the upright position. Eight healthy males (mean ± S.D. age 24 ± 7 years; body mass 75.0 ± 5.8 kg) completed a double-step test protocol involving 2 bouts of 6 minutes of heavy cycle exercise, separated by a 10 minute recovery period, on two occasions in each of the upright and supine positions. Pulmonary O2 uptake was measured breath-by-breath and muscle oxygenation was assessed using near infra-red spectroscopy (NIRS). The NIRS data indicated that the performance of prior exercise resulted in a hyperemia in both body positions. In the upright position, prior exercise had no significant effect on the time constant (
) of the response in Phase II (Bout 1: 29 ± 10 vs. Bout 2: 28 ± 4 s; P=0.91) but reduced the amplitude of the slow component (Bout 1: 0.45 ± 0.16 vs. Bout 2: 0.22 ± 0.14 L.min-1; P=0.006) during subsequent heavy exercise. In contrast, in the supine position, prior exercise resulted in a significant reduction in the Phase II (Bout 1: 38 ± 18 vs. Bout 2: 24 ± 9 s; P=0.03) but did not alter the amplitude of the slow component (Bout 1: 0.40 ± 0.29 vs. Bout 2: 0.41 ± 0.20 L.min-1; P=0.86). These results suggest that the performance of prior heavy exercise enables a speeding of Phase II kinetics during heavy exercise in the supine position, presumably by negating an O2 delivery limitation that was extant in the control condition, but not during upright exercise, where muscle O2 supply was probably not limiting.
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