Fig. 1

Comparison of myocardial oxygenation after hyperventilation and breath-hold across repeated breathing maneuvers. The percent change in global myocardial signal intensity during hyperventilation is represented in blue, and the breath-hold in green. The latter reflects changes of myocardial blood flow and oxygenation and is known as the Breathing-induced Myocardial Oxygenation Reserve (B-MORE). A Percent signal intensity change during hyperventilation and breath-hold for the repeated breathing maneuvers. B Correlation graph of repeated measurements of the myocardial oxygenation response to hyperventilation and breath-hold. C Bland–Altman plot of repeated measurements of B-MORE