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. 2022 Oct 15;12:17336. doi: 10.1038/s41598-022-21702-6

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© The Author(s) 2022

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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Diaphragmatic thickness measured by B mode ultrasound at end-expiration (A1) and end-maximum inspiration (A2). Diaphragmatic mobile curve in M mode of ultrasound was shown during quiet breathing (B1) and deep breathing (B2). Parameters were measured at three consecutive breathing cycles. EQB, excursion during quiet breathing; EDB, excursion during deep breathing; TI, inspiratory time; AUDMC, area under diaphragmatic movement curve in the inspiratory phase. Contractile velocity: diaphragmatic excursion/inspiratory time.