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. 2022 Jan 12;12:801833. doi: 10.3389/fphys.2021.801833

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Copyright © 2022 Mekjavic, Amon, Simpson, Kölegård, Eiken and Macdonald.

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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Nocturnal heart rate (HR, min^{– 1}) and capillary oxyhaemoglobin saturation (SpO_2, %) before (PRE), during, and at the end (POST) of the NORMOXIA and HYPOXIA trials. Values are mean ± SEM, n = 8. ^∗Significant differences between NORMOXIC and HYPOXIC confinement; p < 0.05.