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A: the CO2 reserve under conditions of Oxy and room air. The CO2 reserve was significantly increased (more negative) during Oxy versus room air exposure, *P = 0.03. B: the apneic threshold (AT) demonstrates no significant difference during Oxy vs. room air exposure. Individual and means (±SE) data are presented, where black and white symbols bars represent room air and Oxy trials, respectively.
