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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