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. 2023 Mar 7;14:1109958. doi: 10.3389/fphys.2023.1109958

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Copyright © 2023 Persson, Lodin-Sundström, Linér, Andersson, Sjögreen and Andersson.

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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Changes in arterial (black, SaO₂, n = 18), cerebral (orange, ScO₂, n = 18), and deltoid muscle (blue, SmO₂, n = 17) oxygen saturations in association with apneas (solid lines) and rebreathing periods (dashed lines). Panel 4 (A) shows the means of each variable from before, during, and after tests (see figure legend 3 for details). Panel 4 (B) shows boxplots for the relative changes in each variable at nadir (SaO₂) or during 20–10 s before the end of apneas and rebreathing periods (ScO₂ and SmO₂) compared to their respective control value (see figure legend 2 for details). **p < 0.01 between apnea and rebreathing.