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Dangerous blood pressure increases during exercise can be blocked, UT Southwestern researchers find
Date:4/4/2011

DALLAS April 5, 2011 UT Southwestern Medical Center researchers have identified one reason people with hypertension experience an even greater increase in their blood pressure when they exercise, and they've learned how to prevent the rise.

A study in a March issue of the Journal of Physiology reported that hypertensive people who exercise undergo decreased blood flow and oxygen in muscles. The scientists also identified a specific type of blood pressure medication that minimizes this effect.

"While there are many hypertension medications effective at lowering blood pressure at rest, very few are effective during exercise," said Dr. Wanpen Vongpatanasin, associate professor of internal medicine at UT Southwestern and lead author of the study. "People with high blood pressure need to exercise not only to help their blood pressure, but also their overall cardiovascular health."

Dr. Vongpatanasin said that some people with high blood pressure stop exercising out of fear of heart attack or stroke, and that sometimes physicians counsel those patients to limit activity because of those concerns.

While it's been known that blood pressure increases during exercise in people with hypertension, a mechanism behind the action and a way to block it in humans hadn't been identified previously.

Dr. Vongpatanasin and colleagues had 13 participants with mild hypertension and 13 with normal blood pressure perform hand grip exercises under regular conditions, followed by activity under conditions that affect a part of the nervous system that controls blood pressure.

They found increased nerve activity in hypertensive participants during exercise but not in those with normal blood pressure. Blood flow and oxygen levels in the arm muscles also fell more rapidly in the hypertensive group.

"In normal people, the body can increase blood flow to the working muscle despite increase in nerve activity, which tends to
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Contact: LaKisha Ladson
lakisha.ladson@utsouthwestern.edu
214-648-3404
UT Southwestern Medical Center
Source:Eurekalert

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