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. 2023 Oct 30;11(21):2863. doi: 10.3390/healthcare11212863

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© 2023 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 (https://creativecommons.org/licenses/by/4.0/).

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The Bland–Altman plots of the heart rate measurements at each stage of the CPET. These plots showed the degree of agreement between the two methods during graded exercise testing. The y-axis shows the differences in heart rate values of the CPET and MC-100, while the x-axis represents the mean heart rate values. The plots also indicate the mean differences between the estimated heart rate and heart rate from MC-100 and the upper and lower limits of agreement. (a) Warming up, (b) Stage 1, (c) Stage 2, and (d) Stage 3. CPET, cardiopulmonary exercise test.