Maximal Oxygen Uptake Is Achievedin Hypoxia but Not Normoxia during an Exhaustive Severe Intensity Run

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

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Abstract

Highly aerobically trained individuals are unable to achieve maximal oxygen uptake (V˙ O2max) during exhaustive running lasting ∼2 min, instead V˙ O2 plateaus below V˙ O2max after ∼1 min. Hypoxia offers the opportunity to study the (V˙ O2) response to an exhaustive run relative to a hypoxia induced reduction in V˙ O2max. The aim of this study was to explore whether there is a difference in the percentage of V˙ O2max achieved (during a 2min exhaustive run) in normoxia and hypoxia. Fourteen competitive middle distance runners (normoxic V˙ O2max 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 V˙ O2 data from the CWR tests were modeled using a single exponential function. End exercise normoxic CWR V˙ O2 was less than normoxic V˙ O2max (86 ± 6% ramp, P < 0.001). During the hypoxic CWR test, hypoxic V˙ O2max 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 V˙ O2max during exhaustive severe intensity treadmill running in normoxia, but can achieve the lower V˙ O2max in hypoxia despite a slightly slower V˙ O2 response.
Original languageEnglish
Title of host publicationHigh-Intensity Exercise in Hypoxia- Beneficial Aspects and Potential Drawbacks
EditorsOliver Girard, Donald R. McCrimmon, Gregoire P. Millet
Place of PublicationLaussanne
PublisherFrontiers Research Topics
Chapter3
Pages30-36
Number of pages7
ISBN (Electronic)978-2-88945-406-8
Publication statusPublished - Jan 2018

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    Black, M. I., Potter, C., Corbett, J., Clark, C. C. T., & Draper, S. (2018). Maximal Oxygen Uptake Is Achievedin Hypoxia but Not Normoxia during an Exhaustive Severe Intensity Run. In O. Girard, D. R. McCrimmon, & G. P. Millet (Eds.), High-Intensity Exercise in Hypoxia- Beneficial Aspects and Potential Drawbacks (pp. 30-36). Frontiers Research Topics.