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Original recording: an original recording of middle cerebral artery velocity (MCAv; top) and end‐tidal carbon dioxide levels (PETCO2; bottom) during a cerebrovascular reactivity test. Following baseline, participants inhaled 8% CO2, 21% O2, balance N for two minutes, causing an increase in MCAv. After two minutes of recovery, participants hyperventilated for two minutes, causing a decrease in MCAv
