Confusion surrounding caffeine's effect on blood pressure is long-standing. It was initially thought to decrease blood pressure but later believed to increase it. More than a dozen studies in the late eighty's concluded that coffee does not generate a constant rise in blood pressure. Individuals who do not frequently drink caffeine may experience a small rise in blood pressure when they are exposed to caffeine, but tolerance develops quickly and blood pressure returns to baseline.
Recent studies on subjects with standard blood pressure verify these conclusions. An experiment in moderate coffee drinkers showed that moderate every day utilization of coffee does not raise blood pressure measured in an outpatient health center. A second experiment in customary coffee drinkers showed that caffeine supplements produced a little rise in ambulatory blood pressure, which returned to routine following three days. A third experiment in habitual coffee drinkers showed that abstention from caffeine for 9 weeks had no consequence on blood pressure.
Similar effects of caffeine have been seen in hypertensive subjects. In trials, caffeine administrated to hypertensive subjects raised systolic blood pressure but this result was no longer observed past the first 24 hours. In testing there were no effects on blood pressure of drinking caffeinated coffee or abstention in patients with borderline or slight hypertension.
In a cohort analysis of hypertensive subjects, there were no links between caffeine utilization and all-cause or cardiovascular disease mortality. Therefore there is no proof in hypertensive subjects of a continued effect of caffeine use on either blood pressure or greater than before death rates from cardiovascular disease.
Research into the effects of coffee intake on blood pressure has continued and it can be said that coffee intake is in general not considered to be a critical risk factor for hypertension.
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