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(a) Trajectory of cerebral oxygen regulation vectors during nasal and mouth breathing. Time courses of changes in (b) deoxyhemoglobin (DeoxyHb) and (c) oxyhemoglobin (OxyHb). Average cumulative sums and SEM were calculated every 30 s during nasal and mouth breathing. Asterisks indicate significant differences (*P<0.05). ΔCBV, cerebral blood volume; ΔCOE, cerebral oxygen exchange. au, arbitary unit; ns, not significant.
