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

FIGURE 2.

FIGURE 2

Bland–Altman test plot of the estimated and the measured VO2max. (A) The measured VO2max by cardiopulmonary exercise test (CPX) and estimated VO2max value by the step test. (B) The measured VO2max by CPX and the estimated VO2max by HRV.