Ventilation and gas exchange during sustained exercise at normal and raised CO2 in man.
Five subjects underwent each of three protocols for 43 min: (A) at rest; end-tidal PCO2 was held constant at 2-5 Torr above resting values; (B) during 70 Watt bicycle exercise; PETCO2 was uncontrolled; (C) during 70 Watt exercise; PETCO2 was held 2-5 Torr above exercising values. During all protocols, end-tidal PO2 (PETO2) was held at 100 Torr. The first 5 min of each protocol were excluded from data analysis to approach a steady state, and the remaining 38 min analysed to determine whether a...Expand abstract
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