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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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Scatterplot of the linear regression of the estimated VO_2max in methamphetamine (MA) users: (A) estimated VO_2max in MA users by the step index in group I, (B) estimated VO_2max in MA users by the step index in group II, (C) estimated VO_2max in MA users by SDNN in group I, and (D) estimated VO_2max in MA users by SDNN in group II.