Boston, Humans have a cycle of rise and fall of blood pressure throughout the day,despite the stress and physical activity also influence it. On average, blood pressurepeaked at 9 pm and located at the lowest point in the morning.This fact was revealed in a study at Harvard Medical School, published this week in the journal Circulation. The study involved 28 adults who do not have a problem withblood pressure, both hypertension and hypotension.
The participants engaged in 3 types of experiments to see the impact of biological clock, with fluctuations in blood pressure throughout the day. The three experimentsconducted by changing the sleep-wake cycle or also called circadian rythm.
Of all the experiments conducted, it was revealed that the average lowest bloodpressure was observed at night at about 9 pm. In contrast the average lowest pointmeasured in the morning, for several hours after waking.
This finding is surprising because many previous studies that strokes and heartattacks often occur in the morning, so that no term of morning heart attack.Researchers suspect that trigger heart attack instead of morning blood pressure butother factors.
Besides triggered by increased blood pressure, stroke and heart attack can also betriggered by blood vessel blockage. Damage or rupture of blood vessels also cantrigger a heart attack or stroke if it occurs around the brain.
"This research was conducted with 3 separate experimental designs, 3 different groups and the results were the same. That is the relationship between bloodpressure with morning heart attack need to be reviewed," said Prof. Steven A Shea, who led the study, as quoted from HealthDay, Tuesday (12 / 4 / 2011).