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. 2020 Jan 8;10:1517. doi: 10.3389/fphys.2019.01517

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Copyright © 2020 Reed, Cotie, Cole, Harris, Moran, Scott, Terada, Buckley and Pipe.

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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Bland-Altman plots comparing measured and predicted changes in V̇O_2peak for (A) Bruce treadmill, (B) Astrand-Ryhming cycle ergometer, and (C) Chester step tests, and (D) DASI. The red line represents mean differences between measured and predicted V̇O_2peak. Dashed lines represent the limits of agreement (mean difference ±1.96 standard deviation). CPET, cardiopulmonary exercise testing; DASI, Duke Activity Status Index. A line of best fit is presented for the Bruce treadmill test as proportional bias was detected.