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Timing of the measurement of parameters during MRI. Survey scans, anatomical measurements, cerebral blood flow, susceptometry-based oximetry and MR spectroscopy were recorded during the initial 60 min of normoxia. After 60 min, the subjects started to inhale 10% FiO2 hypoxic air. After 20 min of hypoxic exposure, the MR spectroscopy measurements were repeated. After 32 min, the recording of CBF and SBO was repeated under hypoxic exposure.
