It is a daily ritual for many people. Wake up early. Grab a cup of coffee. And run on the treadmill, or get some sort of workout. But now, researchers suggest the amount of caffeine in just two cups of coffee can cut down the body’s ability to increase blood flow to the heart during exercise. Now this means that vital blood flow to the heart can be cut back when the body needs it most. The report is in the Journal of the American College of Cardiology. Caffeine did not affect heart blood flow when the participants were inactive. Caffeine may block certain receptors in the walls of blood vessels interfering with the normal signaling processes that cause blood vessels to dilate in response to exercise. Now, some people regard caffeine as a stimulant. The studies suggest it may not increase athletic performance. It also raises serious questions about people with heart problems drinking coffee before exercise.
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