Rapid post-exercise cardiac MRI matches peak biventricular volumes then declines linearly

At 13±2 s after exercise, biventricular volumes matched peak effort (all P=1.00), then declined linearly; left ventricular stroke volume fell 2.1 mL per 10 s. Rapid post-exercise cardiac MRI is a practical surrogate with better image quality.

• Ten healthy adults (median age 24, range 21–31; 8 female) completed rest, two peak exercise, and three recovery acquisitions; repeated peak measures differed by only +1±3 mL (LV end-diastolic volume) and -4±7 mL (LV end-systolic volume).
• Recovery-related changes emerged by 54±9 s and affected all parameters by 99±18 s after exercise cessation.
• Post-exercise scans showed higher diagnostic quality and fewer artifacts than in-bore imaging.

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