Figure 2.

Correlations between the measured and estimated $\stackrel{.}{\mathrm{V}}$O_2max obtained from PBF model^BC (A), PBF model^HR0 (B), PBF model^{∆HR3 − HR4} (C), BMI model^BC (D), BMI model^HR0 (E), BMI model^{∆HR3 − HR4} (F), in the training group, showing the regression line and Pearson’s correlation coefficient.