Background: Regular exercise protects against coronary heart disease (CHD) events and improves vascular reactivity. Exercise effects on myocardial flow reserve (MFR) are not well studied.
Methods: We performed dynamic N-13 ammonia positron emission tomography (PET) in 16 postmenopausal women (60 ± 6 years) to measure myocardial blood flow (MBF) and MFR. We also obtained information from each woman on her self-reported physical activity.
Results: Of the 16 patients, 6 reported moderate regular physical activity, and 10 did not. Women who reported regular, at least moderate physical activity had a higher percentage increase in adenosine MBF from rest compared with women who did not exercise (268% vs. 129%, p = 0.04) and had a significantly higher mean maximal MFR (3.68 vs. 2.29, p = 0.04).
Conclusions: These findings provide further mechanistic support for the beneficial cardiovascular effects of exercise.
