Caffeine, Blood Pressure & Heart Rate

The effect of caffeine on heart rate is complex, but the pattern that appears from the available research is that caffeine tends to reduce heart rate at rest and during moderate exercise, but increases it at maximum intensities. By comparison, the effect on blood pressure is much clearer, showing a consistent increase. This increase can be excessive during exercise, raising the chance of pressures above 230 systolic or 120 diastolic, especially in those with hypertension. More at Caffeine, Blood Pressure & Heart Rate.