Maintaining
or boosting your physical activity after age 65 can improve your heart's
electrical well-being and lower your risk of heart attack, according to a study
in the American Heart Association journal Circulation.
In
heart monitor recordings taken over five years, researchers found that people
who walked more and faster and had more physically active leisure time had
fewer irregular heart rhythms and greater heart rate variability than those who
were less active.
Heart
rate variability is differences in the time between one heartbeat and the next
during everyday life.
"These
small differences are influenced by the health of the heart and the nervous
system that regulates the heart," said Luisa Soares-Miranda, Ph.D., lead
author of the study and a researcher at the Harvard School of Public Health in
Boston and the Faculty of Sport at the University of Porto in Portugal.
"Early abnormalities in this system are picked up by changes in heart rate
variability, and these changes predict the risk of future heart attacks and
death."
The
researchers evaluated 24-hour heart monitor recordings of 985 adults (average
age 71 at baseline) participating in the community-based Cardiovascular Health
Study, a large study of heart disease risk factors in people 65 and older.
During
the study, they found:
·
The
more physical activity people engaged in, the better their heart rate
variability.
·
Participants
who increased their walking distance or pace during the five years had better
heart rate variability than those who reduced how much or how fast they walked.
·
"Any
physical activity is better than none, but maintaining or increasing your
activity has added heart benefits as you age," Soares-Miranda said.
"Our results also suggest that these certain beneficial changes that occur
may be reduced when physical activity is reduced."
·
The
researchers calculated that the difference between the highest and lowest
levels of physical activity would translate into an estimated 11 percent lower
risk of heart attack or sudden cardiac death.
"So if you feel
comfortable with your usual physical activity, do not slow down as you get
older — try to walk an extra block or walk at a faster pace,"
Soares-Miranda said. "If you're not physically active, it is never too
late to start."
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