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. 2024 Feb 5;15:1329360. doi: 10.3389/fphys.2024.1329360

TABLE 5.

Agreement results. Comparison of HR (bpm), relative VO2 (mL·kg-1·min-1), and PO (W) at HRVT2 with the different used methods.

HRVT2
Mean differences r Pearson ICC 95% CI Bland Altman
p-value Power r value p-value Power Bias (bpm) SD (bpm)
HR VT2 .017 .755 .692 .004 .935 .656 .27–.86 7.5 10.1
OBLA .006 .891 .665 .007 .913 .632 .23–.85 9.2 10.4
Bsln+1.5 <.001 1.000 .681 .005 .929 .634 .24–.85 21.1 10.8
VO 2 rel VT2 .450 .112 .881 <.001 .998 .884 .70–.96 0.8 4.1
OBLA .226 .219 .888 <.001 .999 .888 .71–.96 1.3 4.0
Bsln+1.5 <.001 .993 .872 <.001 .997 .872 .67–.95 5.1 4.2
PO VT2 .367 .140 .919 <.001 1.000 .917 .78–.97 5.3 21.9
OBLA .026 .637 .932 <.001 1.000 .932 .82–.98 13.1 20.5
Bsln+1.5 <.001 1.000 .882 <.001 1.000 .917 .78–.97 49.9 21.7

95% CI, ICC, confidence interval; HR; heart rate; VO2rel, relative oxygen uptake; PO, power output; VO2rel, relative oxygen uptake; HRVT2, second heart rate variability threshold; VT2, second ventilatory threshold; OBLA, onset of blood lactate accumulation at 4 mmol l-1; Bsln+1.5, lactate baseline +1.5 mmol·L-1.