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. 2018 Jul 9;9:846. doi: 10.3389/fphys.2018.00846

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Copyright © 2018 Karlsson, Gilgien, Gløersen, Rud and Losnegard.

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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Physiological and performance characteristics from the 13.5 km time trial. (A) Section O₂-demands (%VO_2peak), (B) external power (W), (C) continuous HR (b⋅min^-1), (D) time loss compared to lap 1 (s⋅m^-1), (E) speed (m⋅s^-1) and (F) course profile. Due to challenging conditions at ∼2700 m the GNSS-solution were poor. Hence, the spikes in time loss does not represent the real difference. Exercise intensity and external power are presented as mean ± 95% confidence intervals. Open diamond: lap 1. Closed square: Lap 2. Gray triangle: lap 3. Numbers indicate a significant difference (p < 0.05) in average section O₂-demand across the 3 laps from the section with the corresponding number. #Significantly different from lap 1. ^∗Significantly different from lap 2. (n = 7).