Time variations of\(\dot V\)a and\(PA_{CO_2 }\) during inhalation of CO2, either at constant fraction\((FI_{CO{}_2} )\) or at constant flow rate\((\dot VI_{CO{}_2} )\) at rest and during moderate muscular exercise

The time course of\(\dot V\)a and\(PA_{CO_2 }\) has been observed in two healthy subjects during moderate muscular exercise, and during inhalation of CO2 either at constant fraction or at constant flow rate. Six experiments of each type have been done on each subject.