Fig. 2

Excess-\( \dot{\mathrm{V}} \)CO₂ and performance fatigability. a Total expired excess carbon dioxide (excess-\( \dot{\mathrm{V}} \)CO₂) as a predictor of performance fatigability. X-axis represents \( \mathrm{excess}\ \dot{\mathrm{V}} \)CO₂ in liters. Y-axis represents performance fatigability as measured by \( \dot{\mathrm{V}} \)O₂ on-kinetic ORI in ml/s. Regression equation and R² values reported. Gray-shaded area indicates 95% confidence intervals. b Total expired excess carbon dioxide (excess-\( \dot{\mathrm{V}} \)CO₂) as a predictor of performance fatigability. X-axis represents nm-\( \dot{\mathrm{V}} \)CO₂ in liters. Y-axis represents performance fatigability as measured by PFSS (performance fatigability severity score). Regression equation and R² values reported. Gray-shaded area indicates 95% confidence intervals