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. 2020 Apr 30;11:322. doi: 10.3389/fphys.2020.00322

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Copyright © 2020 Wang, Zhang, Ouyang, Jiang, Qu, Peng and Luo.

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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The difference in VO_2max by the cardiopulmonary exercise test, the step test index, and the post-SDNN: (A) overall comparison and (B) grouping comparison.