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. 2022 Dec 7;13:1018057. doi: 10.3389/fphys.2022.1018057

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At least a portion of this work is authored by Eli F. Kelley on behalf of the U.S. Government and as regards Dr. Kelley and the U.S. Government, is not subject to copyright protection in the United States. Foreign and other copyrights may apply.

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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Arterial partial pressure of carbon dioxide during the 30 s, 60 s, and 120 s oscillation exposures. Values represent means ± SD. (A) depicts the 30 s oscillations; (B) depicts the 60 s oscillations; and (C) depicts the 120 s oscillations. Significant difference from the Pretesting period, p < 0.05. Ɨ Significant difference from the Pretesting period, p < 0.01.