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 Patients who started with low fitness levels but were able to
improve to intermediate or high fitness levels reduced their risk of
death during the study by roughly 40 percent, say the authors.
Exercise capacity is measured during an exercise stress test, which
is typically performed on a treadmill or stationary bike. Someone
with a higher maximal exercise capacity is able to achieve a faster
walking pace or climb more stairs before getting tired, lead author
Clinton Brawner told Reuters Health in an email interview.
“Maximal exercise capacity is our ability to do work. It is
dependent on the health of the heart, lungs, blood, and muscles,”
said Brawner, who is a researcher at the Edith and Benson Ford Heart
and Vascular Institute at the Henry Ford Hospital in Detroit.
“More importantly, higher exercise capacity means an individual is
able to complete activities of daily living, like working around the
house, more easily and with less fatigue than someone with a lower
exercise capacity,” Brawner said.
While there is a wealth of data to support the relationship between
fitness and outcomes, like premature death, there are only a few
studies that have evaluated whether changes in fitness are related
to outcomes and none included women, said Brawner.
To address that knowledge gap, Brawner and colleagues analyzed data
from the Henry Ford Exercise Testing (FIT) project, which involved
adults from Detroit, Michigan who underwent physician-ordered
exercise stress tests on treadmills between 1991 and 2009.
As reported in the Mayo Clinic Proceedings, the study team looked at
more than 10,000 patients who performed two exercise stress tests at
least one year apart.
After an average follow up of 8.6 years, 9.5 percent of the men and
7.4 percent of the women had died.
Compared to women who maintained low fitness levels at both tests,
the women who improved from low fitness levels on the first test to
intermediate or high fitness levels on the second test were 37
percent less likely to have died.
Men who improved from low fitness levels at baseline to intermediate
or high fitness levels were about 44 percent less likely to have
died compared to men who hadn’t moved out of the low fitness
category.
Having low fitness is an important risk factor for premature death
and improving fitness is important to health, said Brawner.
“Improving fitness is within our control because our fitness is
influenced by our level of physical activity,” he said.
To improve fitness, people need to increase their current level or
amount of physical activity, which is best accomplished through
regular exercises, such as a walking or running program, said
Brawner.
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“Aging, healthy aging, in general, is not a passive process, we have
to be active about it, we have to make plans and decisions and
follow through on that. We can see from this article that it makes a
difference,” Dr. Jonathan Whiteson told Reuters Health in a phone
interview.
Whiteson, an assistant professor of rehabilitation medicine and
medicine at NYU Langone Medical Center in New York City, wasn’t
involved in the study.
Whiteson said that it's very important that people with pre-existing
health conditions such as diabetes, high blood pressure, high
cholesterol, or obesity be evaluated by their physician before they
get involved in any intense aerobic exercise program.
“(You’ve) got to make sure you're safe for exercise, number one.
Anyone with other complex health issues should be checked out and
make sure they're safe for exercise. That being said and for those
people who are perhaps younger, who don't have those risk factors,
again, it's a matter of getting up and doing something,” he said.
Whiteson said people should push themselves to the intensity where
they’re feeling fatigued and tired.
“The more you do, the less fatigued and tired you're going to get.
That's training; you're becoming fitter," he said.
Nobody gets up in the morning and runs a marathon. They have to
start running the first mile, the first five miles, said Whiteson.
"When you to do five miles the first time, boy you're going to feel
it. But once you've done it six or seven times it gets a little
easier, that's the training process," he said.
SOURCE: http://mayocl.in/2lbvG5G Mayo Clinic Proceedings, online
February 6, 2017.
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