Higher Rate of Morning Heart Attacks Not Due to Blood
MONDAY, April 11 (HealthDay News) -- Normal daily fluctuations
in blood pressure aren't linked with the well-documented fact that
people are more likely to suffer a heart attack or stroke in the
morning, a new study shows.
It included 28 people without high blood pressure who underwent
three types of sleep/wake cycle experiments designed to assess the
connection between the internal body clock and the daily rise and
fall in blood pressure.
In all three experiments, the volunteers showed an internal
daily blood pressure variation with a peak at about 9 p.m. and the
lowest blood pressure occurring in the late morning.
The researchers said the surprising finding that blood pressure
is lowest in the morning means it's unlikely that the internal
blood pressure cycle is connected to the increased risk of heart
attack and stroke in the morning.
The study was published April 7 in the journal
"We used three complementary experimental protocols and three different groups and found essentially the same results. That means we're dealing with something very robust," lead author Steven A. Shea, an associate professor of medicine at Harvard Medical School, said in a journal news release.
The American Academy of Family Physicians has more about
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