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Found in coffee, tea and soft drinks,
caffeine is the most widely
used drug in the world. In the Western world, 8
out of 10 adults consume caffeine in some form.
The amount of caffeine in just one cup
of coffee could be enough
to harden a person's arteries for several hours
afterward.
Hardened arteries, or atherosclerosis,
put extra pressure on the heart and increase
the risk of heart attack and stroke.
After drinking a cup of coffee, blood
pressure can rise up to 5 or even 10 millimeters of mercury.
The amount depends on the individual and dose.
Regular rises of this magnitude are important
in a person's long-term prognosis and could increase their
risk of suffering from a stroke or heart attack. People with
high blood pressure should consider
reducing their caffeine intake or having
caffeine-free drinks.
The researchers gave a group of 10 healthy
volunteers either inactive placebo capsules or capsules containing
100 milligrams of caffeine -- a quantity equivalent to one
cup of coffee.
On another day, the volunteers received
the opposite capsule from the previous dosage. Neither the
volunteers nor the testers knew the sequence in which the
volunteers had been given the capsules.
Caffeine consumption caused an increase
in wave reflection -- a measure of arterial stiffness -- for
at least 2 hours, according to the study results.
European
Society of Cardiology Congress Stockholm, Sweden September
4, 2001
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