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Prolonged and sustained endurance training prevents stiffening of the heart, a condition associated with the onset of heart failure, according to a study reported in the Sept. 28 issue of Circulation.
A sedentary lifestyle, in addition to aging, puts older people at risk for heart failure, the leading cause of hospitalizations for patients over 65 and a condition that affects eight out of every 1,000 people older than 70.
“It appears that lifelong exercise training completely prevented the stiffening of the heart muscle that has been thought to be an inevitable consequence of aging. We found that it is aging in addition to being sedentary,” said study author Dr. Benjamin Levine, professor of internal medicine at the University of Texas Southwestern Medical Center at Dallas.
“If people can train and sustain it, a huge impact will be made on one of the biggest scourges of the elderly, which is heart failure with a normal ejection fraction, also called diastolic heart failure,” added Levine. “The overall health of the population would radically improve if a larger number of people would make exercise a part of their daily life.”
About 40 percent of all hospitalizations for heart failure in patients 65 and older are due to diastolic heart failure, a condition in which the heart appears to pump normally. Diastolic heart failure results from stiffening of the heart muscle, causing excess fluid to accumulate in the lungs, feet, ankles and legs.
The researchers measured the function and compliance of the left ventricle in 12 healthy sedentary seniors whose average age was 70 years old, 12 master athletes whose average age was 68 and 14 young sedentary controls whose average age was 29. The left ventricle is the heart’s main pumping chamber.
Six of the master athletes, who participate in events from swimming to track, were nationally ranked competitors and six were regional champions. Sedentary participants had not engaged in regular endurance exercise throughout their life.
The researchers tested whether left ventricular compliance decreased with aging alone, or if physical inactivity contributed equally to this process.
“We found that the older, sedentary individuals’ hearts were 50 percent stiffer than the master athletes, which we expected,” said Levine. “But what we didn’t expect was that the hearts of these senior athletes were indistinguishable from those of the healthy younger participants.
“That specific finding led us to conclude that a sedentary lifestyle is associated with a decline of ventricular compliance and prolonged, sustained endurance training preserves ventricular compliance and may reduce the high incidence of heart failure in the elderly.”
Levine and his colleagues have already designed an endurance-training program for several of the elderly, sedentary study participants that has already yielded dramatic results.
“About two-thirds of the sedentary, elderly participants have trained for a year and there is already improvement in their cardiac compliance. Their hearts are more muscular and more flexible,” Levine said.
A sedentary lifestyle is detrimental to one’s health, but starting and sticking with an endurance-training program plays a major role in reversing the damage done to the heart, even if that program is initiated later in life, he added.
Most of the Masters athletes were not elite athletes when they were younger, Levine pointed out. In fact, most of them did not start training until they were in their 30s.
“It’s not necessarily starting an exercise program that is important, but sustaining it and making it a part of your daily life,” he said.
Source: Medical Week Staff week of September 18, 2004
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