People in their 30s may risk a heart attack or stroke in later life even when they have "normal" blood pressure, if it's too high or steeply rising, according to a new study led by UCL researchers. The study, published in the journal Circulation: Cardiovascular Imaging, found that people with higher blood pressure in their 30s and 40s, as well as in the three decades after that, had reduced blood flow to their heart muscle—which pumps blood around the body—at the age of 77.