Cerebral Hemodynamics at Altitude: Effects of Hyperventilation and Acclimatization on Cerebral Blood Flow and Oxygenation
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Full-text controlled repeated-measures physiology n12 sea level/n9 altitude day2/n7 day7 found lower cerebral tissue oxygen saturation (68.8% to 63.5%) and lower cerebral flow at sea level during a three-minute hyperventilation protocol, while cerebral saturation increased at altitude day2: the effect depends on ambient oxygen and hypocapnic vasoconstriction, not a universal sustained therapeutic oxygenation benefit.