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. 2020 Jun 17;9(6):1897. doi: 10.3390/jcm9061897

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Correlation between changes in HRR and changes in VE/VCO_2slope. Captions: HRR: heart rate recovery; VE/VCO_2slope: the slope of increase in ventilation over carbon dioxide output.