Fig. 2.

The relationships between minute ventilation (${\dot{V}}_{\mathrm{E}}$), end-tidal CO₂% (FetCO₂), and trait anxiety. a Linear plot of ${\dot{V}}_{\mathrm{E}}$ and trait scores. No significant correlation was observed (ρ = 0.384). b Comparison of ${\dot{V}}_{\mathrm{E}}$ in HT and in LT. No significant difference was observed in ${\dot{V}}_{\mathrm{E}}$. c Linear plot of FetCO₂ and trait scores. No significant correlation was observed (ρ = −0.038). d Comparison of FetCO₂ in HT and in LT. No significant difference was observed in FetCO₂. Median ${\dot{V}}_{\mathrm{E}}$ and FetCO₂ in HT and LT were indicated with horizontal bars. The vertical bars indicate the range and the horizontal boundaries of the boxes represent the first and third quartiles