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. 2019 Aug 2;10:999. doi: 10.3389/fphys.2019.00999

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Copyright © 2019 Gronwald, Hoos and Hottenrott.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Heart rate (A), blood lactate concentration (B) during resting state and all cycling conditions during normoxia (NC, black color) and normobaric hypoxia (HC, gray color). WU (1): Warm-Up at 100W; WU (2): Warm-Up at 150W; 10–100%: Percentage of continuous workload; CD: Cool-Down at 100W. ^*Significant compared to preceding measurement; §Significant change WU (1) vs. CD at 100W; ¥Significant change 10% vs. 100%; #Significant change NC vs. HC (p ≤ 0.05).