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Benefits
Of Exercise
Longevity
and Aging:
Exercise,
even after age 50, can add healthy and active years to one's life.
Studies continue to show that it is never too late to start exercising
and that even small improvements in physical fitness can significantly
lower the risk of death. Simply walking regularly can prolong life
in the elderly. Moderately fit people, even if they smoke or have
high blood pressure, have a lower mortality rate than the least
fit.
Resistance
training is important for the elderly, because it is the only form
of exercise that can slow and even reverse the decline in muscle
mass, bone density, and strength. Adding workouts that focus on
speed and agility may be even more protective for older people.
Flexibility exercises help reduce the stiffness and loss of balance
that accompanies aging.
Cardiovascular
Health (Heart Disease and Stroke):
General
Guidelines. Inactivity is one of the four major risk factors
for heart disease, on par with smoking, unhealthy cholesterol, and
even high blood pressure. Like all muscles, the heart becomes stronger
and larger as a result of exercise so it can pump more blood through
the body with every beat. Exercise does not increase the maximum
heart rate, but a fit heart can pump more blood at this maximum
level and can sustain it longer with less strain.
The resting heart rate of those who exercise is also slower, because
less effort is needed to pump blood. For preventing heart disease
frequency of exercises may be more important than duration. Exercise
even helps reverse some of the effects of smoking. Children should
be especially encouraged to exercise every day to prevent heart
disease later in life.
High
Blood Pressure:
Studies
indicate that regular exercise helps keep arteries elastic, even
in older people, which in turn keeps blood flowing and blood pressure
low. Sedentary people have a 35% greater risk of developing hypertension
than athletes do. No person with high blood pressure should start
an exercise program without consulting a physician. Studies have
shown that high-intensity exercise may not lower blood pressure
as effectively as moderate intensity exercise.
In
one study, for example, moderate exercise (jogging two miles a day)
controlled hypertension so well that more than half the patients
who had been taking drugs for high blood pressure were able to discontinue
their medication. Studies have indicated that T'ai Chi, an ancient
Chinese exercise involving slow, relaxing movements may lower blood
pressure almost as well as moderate-intensity aerobic exercises.
Before exercising, people with hypertension should avoid caffeinated
beverages, which increase heart rate, the workload of the heart,
and blood pressure during physical activity.
Stroke:
The
benefits of exercise on stroke are uncertain. According to one analysis,
a group of 11,000 men, men who burned between 2,000 and 3,000 calories
a week (about an hour of brisk walking five days a week) cut their
risk of stroke in half. Groups who burned between 1,000 and 2,000
calories or more than 3,000 calories per week also gained some protection
against stroke but to a lesser degree. In the same study, exercise
that involved recreation was more protective than exercise routines
consisting simply of walking or climbing.
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