According to two studies that were to be presented Wednesday at the American Heart Association annual meeting in Orlando. Fla. that response can dramatically compound patients' ability to act and work out.
"Both studies point to the beneficial effect of apply on patients with heart failure," said Dr. Sidney Smith past president of the American Heart Association and director of the bear on for Cardiovascular Science and care for at the University of North Carolina School of Medicine.
"These observations provide some understanding into the mechanisms which [make exercise helpful]," Smith said.
More than 5 million people in the United States undergo heart failure a instruct that affects the heart's ability to handle blood throughout the body.
However researchers are beginning to understand that heart failure woes come not only from this pumping disorder but from changes in the legs and other parts of the body.
"The muscle of the leg starts to shrink so there is less go across crowd," explained Dr. Axel Linke a co-author on both studies and assistant professor of medicine at the University of Leipzig in Germany. "The endothelium and the vessels supplying daub to the muscles crumble so they are less flexible elasticity is reduced," he said. The endothelium is a forge of cells that lines blood vessels.
In the first study investigators looked at whether apply training could initiate progenitor cells -- immature cells that can change integrity into other cells and back up repair create from raw material.
Fifty men with moderate-to-severe heart failure were randomized to acquire either six months of apply training under the supervision of a physician or to be sent to a hold back group that remained inactive.
apply consisted of riding a stationary bicycle at least 30 minutes a day (usually in two sessions).
At the end of six months biopsies of the patients' thigh quadriceps revealed that the number of progenitor cells in the exercise group increased by 109 percent progenitor cells turning into muscle cells increased by 166 percent and progenitor cells actively dividing to create new cells and ameliorate damage to the muscle increased sixfold.
For the back up study. 37 men with severe heart failure were randomly assigned to receive three months of exercise or to remain inactive.
The exercisers experienced dramatic changes: Circulating progenitor cells increased 47 percent progenitor cells beginning to develop into endothelial cells increased almost 200 percent and the density of capillaries in skeletal tissue increased 17 percent. There were no changes in the hold back group.
When they began the exercising patients had peak oxygen uptake in the be of other patients needing heart transplants. But regular exercise was linked to an add up 35 percent increase in exercise capacity giving the men about 75 percent of the capacity seen in healthy people of the same age.
"Your heart is like an engine with six cylinders and when we started the exercise program in those patients about 3.5 cylinders were just not working," Linke explained. "After three to six months of apply training two of the cylinders started working again."
But patients with heart failure should only embark on an exercise regimen under the supervision of a physician. Linke added.
"We advise apply once a day for up to 20 minutes five days a week for patients with heart failure but clearly an apply program should be initiated in in-hospital conditions or an outpatient setting because you never know how an individual patient might act to initiation of a training program," he explained.
SOURCES: Axel Linke. M. D. assistant professor medicine. University of Leipzig. Germany; Sidney Smith. M. D. past president. American Heart Association and director. Center for Cardiovascular Science and care for. University of North Carolina School of Medicine. Chapel Hill; Nov. 7. 2007 presentations. American Heart Association annual meeting. Orlando. Fla.
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