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. 2019 Mar 1;119(5):1213–1224. doi: 10.1007/s00421-019-04111-y

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 5 — Oxygen consumption and heart rate responses during exercise at a fixed RPE in variable inspired oxygen fractions. a Oxygen consumption ( $\dot{V}$ O₂); b heart rate (HR). Each condition is represented as severe hypoxia (black circle), moderate hypoxia (grey circle), and normoxia (white circle)