Elderly
men with high blood pressure can lower their risk of death with even moderate
levels of fitness, according to new research in the American Heart
Association's journal Hypertension.
"This
level of fitness is achievable by most elderly individuals engaging in a brisk
walk of 20 to 40 minutes, most days of the week," said Charles Faselis,
M.D., lead author of the study and chief and professor of medicine at George
Washington University in Washington, D.C.
For
the study, researchers assessed the fitness status of 2,153 men, aged 70 years
and older with high blood pressure by a standard treadmill exercise test.
Researchers applied the international units used to measure fitness, called
metabolic equivalents (METs), to determine the men's peak fitness levels. A MET
is equal to 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 work.
Researchers
categorized the men as very low fitness, low fitness, moderate fitness, and
high fitness.
"To
put this in perspective, the peak MET level of a sedentary 50-year-old is about
five to six METs," said Peter Kokkinos, Ph.D., senior author and professor
at Veterans Affairs Medical Center, Georgetown University School of Medicine
and George Washington University School of Medicine and Health Sciences.
"For
a moderately fit individual, it's about seven to nine METS, and for a highly
fit person, it's 10 to 12 METs. Still, marathon runners, cyclists and other
long distance athletes often have MET levels of 20 or higher."
After
an average follow-up of nine years, researchers found that the risk of death
was 11 percent lower for every one-MET increase in exercise capacity.
"Although
this does not sound like a big drop in the death rate, the impact of it is
revealed when we compared low-, moderate- and high-fit individuals to the least
fit, who achieved less or equal to four METs," Kokkinos said.
Compared
to least-fit men (up to 4 peak METs):
* Those in the low-fit category
(4.1 to 6 peak METs) had an 18 percent lower risk of death.
* Moderately-fit men (6.1
to 8 peak METs) had a 36 percent lower risk of death.
* High-fit men with peak
METs of more than 8 reduced the risk of death by 48 percent.
"For
every 100 people who died in the least-fit category, 82 died in the low-fit, 64
in the moderate-fit and 52 in the high-fit categories," Kokkinos said.
"The death rate is cut in half for those in the highest fitness
category."
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