Maximal oxygen uptake is achieved in hypoxia but not normoxia during an exhaustive severe intensity run

Matthew I. Black, Christopher R. Potter, Jo Corbett, Cain C. T. Clark, Stephen B. Draper

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Abstract

Highly aerobically trained individuals are unable to achieve maximal oxygen uptake (V̇O2max) during exhaustive running lasting ~2 min, instead V̇O2 plateaus below V̇O2max after ~1 min. Hypoxia offers the opportunity to study the (V̇O2) response to an exhaustive run relative to a hypoxia induced reduction in V̇O2max. The aim of this study was to explore whether there is a difference in the percentage of V̇O2max achieved (during a 2 min exhaustive run) in normoxia and hypoxia. Fourteen competitive middle distance runners (normoxic V̇O2max 67.0 ± 5.2 ml.kg−1.min−1) completed exhaustive treadmill ramp tests and constant work rate (CWR) tests in normoxia and hypoxia (FiO2 0.13). The V̇O2 data from the CWR tests were modeled using a single exponential function. End exercise normoxic CWR V̇O2 was less than normoxic V̇O2max (86 ± 6% ramp, P < 0.001). During the hypoxic CWR test, hypoxic V̇O2max was achieved (102 ± 8% ramp, P = 0.490). The phase II time constant was greater in hypoxia (12.7 ± 2.8 s) relative to normoxia (10.4 ± 2.6 s) (P = 0.029). The results demonstrate that highly aerobically trained individuals cannot achieve V̇O2max during exhaustive severe intensity treadmill running in normoxia, but can achieve the lower V̇O2max in hypoxia despite a slightly slower V̇O2 response.
Original languageEnglish
Article number96
JournalFrontiers in Physiology
Volume8
Early online date21 Feb 2017
DOIs
Publication statusEarly online - 21 Feb 2017

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