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. 2021 Jan 28;11:2545. doi: 10.1038/s41598-021-81797-1

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Example of Cardiac MR imaging of one subject, displaying a midventricular short axis view at papillary muscle level at end-diastole. Compared to rest (left panel), the left ventricle (LV) and right ventricle (RV) are similar in size at end of apnea with maximum expiration (center panel). In contrast, at the end of > 240 s of apnea with glossopharyngeal insufflation (right panel) there is a decrease in LV and RV size and thickening of the ventricular wall (double-headed arrows) compared to rest.