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High fitness level reduces chance of developing hypertension

People with the highest fitness levels are less likely to develop hypertension, according to new research in the Journal of the American Heart Association.
“If you’re exercising and you’re fit, your chances of developing hypertension are much less than someone else who has the same characteristics but isn’t fit,” said Mouaz H. Al-Mallah, M.D., senior author of the study and a cardiologist at the Henry Ford Heart and Vascular Institute in Detroit, Michigan. “Increasing exercise and fitness levels probably protects against many diseases.”
More than 57,000 participants in the Henry Ford Exercise Testing Project (The FIT Project) in 1991-2009 were referred for a treadmill stress test because they experienced chest pain or shortness of breath or to rule out ischemia.
Researchers measured the participants’ physical fitness by calculating how much energy they burned in metabolic equivalents (METs), an estimate of the amount of oxygen the body uses per kilogram of body weight per minute. One MET is the amount of energy expended at rest; anything above that represents a level of exertion. High-intensity workouts translate to more METs.
At the beginning of the study, 35,175 participants had a history of high blood pressure.

Researchers found:

Those whose maximal exercise output was less than six METs had an over 70 percent chance of having high blood pressure at baseline compared to less than 50 percent for those with METs of greater than or equal to 12.
Those who reached 12 METs or more during the stress test had a 20 percent lower risk of developing hypertension compared to those reaching < 6 METs.
Of the 8,053 new cases of hypertension diagnosed during the study, 49 percent were in the lower fitness (less than six METs) group and 21 percent were in the higher fitness group (more than 12 METs).
There was a relationship between fitness and hypertension regardless of age, gender, race, obesity, resting blood pressure, or diabetes.
Further study is needed to determine how increasing and decreasing fitness levels impact hypertension risk over time, Al-Mallah said.
“Fitness is a strong predictor of who develops hypertension and who does not,” said Al-Mallah, who is also an associate professor of medicine at Wayne State University and head of cardiac imaging at King Abdulaziz Cardiac Center in Saudi Arabia. “Hypertension is associated with a lot of other illnesses and adds significantly to healthcare costs, so we need to know how we can reduce it.
“This is a clear message to everyone: patients, physicians and lawmakers. It’s very important to be fit.”



Source: American Heart Association

Full bibliographic information:
High fitness level reduces chance of developing hypertension
Physical Fitness and Hypertension in a Population at Risk for Cardiovascular Disease: The Henry Ford ExercIse Testing (FIT) Project
J Am Heart Assoc. 2014;3:e001268 doi: 10.1161/JAHA.114.001268)

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