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. 2023 Mar 7;14:1109958. doi: 10.3389/fphys.2023.1109958

TABLE 2.

End-tidal partial pressure of oxygen and carbon dioxide before and after apnea or rebreathing.

Apnea Rebreathing
Pre-PETO2 (mmHg) 118.7 (7.0) 117.1 (7.1) p = 0.06
Post-PETO2 (mmHg) 71.3 (9.9) 59.8 (9.6) p < 0.001
Pre-PETCO2 (mmHg) 32.8 (4.3) 33.5 (4.3) p = 0.09
Post-PETCO2 (mmHg) 45.2 (3.6) 47.4 (3.9) p < 0.001

Values are means (SD), n = 18. Pre-PETO2 and Pre-PETCO2 were collected during the final expiration before each apnea and rebreathing. Post-PETO2 and Post-PETCO2 were collected during the expiration terminating each apnea and rebreathing. PETO2, End-tidal partial pressure of oxygen; PETCO2, End-tidal partial pressure of carbon dioxide.