American Heart Association- Stroke/Hypoxia Study

An oxygen monitor will continuously measure and record the fraction of inspired oxygen delivered to the subject. Inspired fraction of oxygen (FiO2) of the gas mixture will be individually adjusted using the valve settings to reach the targeted SpO2. The gas mixtures administered during the four sessions will be 21% O2 (target SpO2 = 95%), 17% O2 (target SpO2 = 92%), 13% O2 (target SpO2 = 87%) and 9% O2 (target SpO2 = 82%).