Another one of the benefits of exercise reveals itself.
Exercise can reverse damage to sedentary, aging hearts and help prevent risk of future heart failure — if it’s enough exercise, and if it’s begun in time, according to a new study by cardiologists at UT Southwestern and Texas Health Resources.
To reap the most benefit, the exercise regimen should begin by late middle age (before age 65), when the heart apparently retains some plasticity and ability to remodel itself, according to the findings by researchers at the Institute for Exercise and Environmental Medicine (IEEM), which is a collaboration between UT Southwestern Medical Center and Texas Health Presbyterian Hospital Dallas.
And the exercise needs to be performed four to five times a week. Two to three times a week was not enough, the researchers found in an earlier study.
“Based on a series of studies performed by our team over the past 5 years, this ‘dose’ of exercise has become my prescription for life,” said senior author Dr. Benjamin Levine, Director of the Institute and Professor of Internal Medicine at UT Southwestern. “I think people should be able to do this as part of their personal hygiene — just like brushing your teeth and taking a shower.”
Sedentary aging can lead to a stiffening of the muscle in the heart’s left ventricle, the chamber that pumps oxygen-rich blood back out to the body, he explained.
“When the muscle stiffens, you get high pressure and the heart chamber doesn’t fill as well with blood. In its most severe form, blood can back up into the lungs. That’s when heart failure develops,” said Dr. Levine, who holds the S. Finley Ewing Chair for Wellness at Texas Health Dallas and the Harry S. Moss Heart Chair for Cardiovascular Research. He also holds the Distinguished Professorship in Exercise Sciences at UT Southwestern, which is celebrating its 75th anniversary this year.
Earlier research by UT Southwestern cardiologists showed that left ventricular stiffening often shows up in middle age in people who don’t exercise and aren’t fit, leaving them with small, stiff chambers that can’t pump blood as well.
However, the researchers also found that the heart chamber in competitive masters-level athletes remains large and elastic, and that even four to five days of committed exercise over decades is enough for noncompetitive athletes to reap most of this benefit.