Fig. 3
The ROC curve of VO2 at VT, E-VCO2, â–³CO2, R-PETCO2, E-PETCO2, and â–³PETCO2. VO2 at VT: Oxygen consumption per kilogram of weight per minute at anaerobic threshold; E-VCO2: Exercise carbon dioxide production; â–³CO2: Margin of Minute ventilation carbon dioxide production; R-PETCO2: Rest partial pressure of end-tidal carbon dioxide; E-PETCO2: Exercise partial pressure of end-tidal carbon dioxide; â–³PETCO2: Margin of partial pressure of end-tidal carbon dioxide