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. 2018 May 29;9:601. doi: 10.3389/fphys.2018.00601

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Copyright © 2018 Eigendorf, May, Friedrich, Engeli, Maassen, Gros and Meissner.

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 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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Analysis of (A) time-to-exhaustion in endurance tests at 65% P_max (ET65) and 80% P_max (ET80) at baseline (BSL) testing before the start of the HIHVT and at endpoint (END) testing after the entire HIHVT. Data are presented as means ± SE. ET65 and ET80 improvement: % improvement in time-to-exhaustion at END compared to BSL testing. ^*Significantly different from BSL testing, p < 0.05. Analysis of (B) respiratory exchange ratio in endurance tests ET65 at BSL and END testing. Data are presented as means ± SE. Minutes 0–5: rest (r) on the cycle ergometer; min 6–13: 2 min running-in at 10 Watt (W) followed by 6 min warm-up (wu) at 30% maximum power (P_max); endurance test to exhaustion at 80% P_max (exercise); recovery (rec); end: end of the test.