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. 2021 Jun 18;8:691611. doi: 10.3389/fcvm.2021.691611

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Copyright © 2021 Hedwig, Nemchyna, Stein, Knosalla, Merke, Knebel, Hagendorff, Schoenrath, Falk and Knierim.

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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Correlation between peak oxygen uptake and global work parameters. All patients who underwent cardiopulmonary exercise testing. (A) Correlation between peak oxygen uptake (VO₂ peak) and global work index (GWI). (B) Correlation between VO₂ peak and global constructive work (GCW).