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Associations of PetCO2 with arterial O2 saturation and with PtcCO2 at rest and during lower-body negative pressure (LBNP). Top: SaO2 increases within a minute of rebreathing, which reaches plateau throughout the end of the rebreathing procedure at rest or during LBNP. Bottom: compared with PetCO2, responses of PtcCO2 to rebreathing are less robust and delayed. Data are group mean ± SD from 9 subjects.
