[Use of gas mixtures with a high oxygen and CO2 content for normalizing external respiratory function and the blood acid-base state in muscle fatigue]

Use of gas mixtures containing 1% CO2+ +35% O2 and 35% O2 in the air during a passive rest after a high workload led to the neutralization of acid metabolites and recovery of acid-base equilibrium due to a greater oxygen consumption, retention of metabolic CO2 in plasma, and accumulation of endogenous CO2 in body fluids.