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Ventilatory response to hypoxia (Hx) reported as the change (Δ) in ventilatory equivalents [Δminute ventilation (V̇e)/O2 consumption (V̇o2), hypoxic ventilatory response (HVR); A], and the percent change in ventilatory equivalent ventilation from control (B) in young (Y), middle-aged (MA), and old male and female rats during eucapnic Hx (inspired O2 fraction = 12%). *P < 0.05.
