Pearson correlation Mean bias value Lower and Upper bias values VT1 vs. HRVT-RMSSD Power watts r=0.97 - 3.5 % (-5.4, 0.8) watts   (p<0.01)             VO2 mL.min-1 r=0.99 -2.9 % (-8.0, 1.0) mL.min-1   (p<0.01)     Heart rate       Beat.min-1 r=0.99 -1.2 % (-4.8, 0.8) Beat.min-1   (p<0.01)     VT1 vs. HRVT-HFp Power watts r=0.92 1.1 % (-0.2, -0.1) watts   (p<0.01)     VO2 mL.min-1 r=0.98 -2.3 % (-3.0, -1.0) mL.min-1   (p<0.01)     Heart rate       beat.min-1 r=0.98 -0.4 % (-2.2, 3.1) beat.min-1   (p<0.01)

Table 2: Correlations, mean bias and limits of agreement between first ventilatory threshold determined by gas exchange (VT1) and cardiac thresholds determined in time (HRVT-RMSSD) or time-frequency (HRVT-HFp) domains.