In the study led by Benjamin Chant, a doctoral student at the University of Bristol, participants in all four groups took exercise tests on stationary bicycles. They had their blood pressure measured every 90 seconds until they reached a point where they couldn’t exercise any further.
Blood pressure generally rises for everyone during exercise, but only to reasonable levels in people who are healthy.
But blood pressure rose excessively among the study group who had their blood pressure under control. Similar rises occurred among patients whose condition was either uncontrolled or untreated.
The exaggerated increase started when participants had only reached a moderate level of exercise – around 50 percent of their peak point.