Osteoporosis
and Physical Activity
By Deborah L. Mullen, CSCS
Health
Savings Account
Each day presents itself as an opportunity to enhance
your health and fitness level by engaging in physical
activity. If you choose to put off until "tomorrow,"
you miss that opportunity: another check mark is added
in the "sedentary day" column and a withdrawal
is made from your health savings account. If, however,
you choose to be physically active, you make an investment
in your health account. |
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This
investment is especially important in combating age-related
declines in metabolism, muscle mass and bone density. With
regard to osteoporosis, many older people, especially women,
have bankrupt health accounts because they didn’t
invest in their health when they were younger by exercising
regularly and eating properly.
Osteoporosis
is caused by the loss of bone mass, creating thin, porous
bones which are fragile and easily fractured. Fractures
typically occur in the hip, spine and wrist. A hip fracture
usually requires hospitalization, can limit a person's ability
to walk unassisted and may cause permanent disability or
even death. Fractures of the vertebra in the spine also
have serious consequences, including loss of height, severe
back pain and deformity. |
Bone
Basics
Bone isn’t a lifeless structure but a complex, living
tissue. It has the capacity for growth and regeneration if
damaged and is sensitive to the forces it experiences. Bone
tissue is constantly undergoing remodeling in which old bone
is removed and new bone is formed. After age 35, however,
bones begin to break down faster than new bone can be formed.
In women, bone loss accelerates after menopause because the
ovaries stop producing estrogen, the hormone that protects
against bone loss. The
critical years for building bone are before the age of 20.
Some experts believe that young women can increase their
bone mass by as much as 20 percent - a critical factor in
protecting against osteoporosis. In order to stimulate increases
in bone density, mothers should provide their daughters
with adequate intakes of calcium and vitamin D and make
sure they engage in weight-bearing physical activity.
Deposits
into your health savings account before the age of 20 are
the most beneficial in building up your principal (bone
mass). However, if you stop making deposits and become sedentary,
you’re essentially making withdrawals which could
lead to osteoporosis. Both building and maintaining bone
mass is the best defense against developing this disease.
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A Mile
A Day Slows Bone Loss
According
to the U.S. Dept. of Agricultural Research Service women
who walk a mile or more a day lose bone more slowly than
women who do little walking. The researchers found that
the mile-per-day walkers had 7% more bone in their legs
than the women who walked less than a mile a day. Also,
the exercisers achieved cardiovascular benefits.
Exercise
that forces you to work against gravity (weight-bearing
exercises) such as jogging, stair climbing, hiking, aerobic
dance and racquet sports are beneficial in slowing the rate
of bone loss. Remember, however, the benefits of exercise
last only as long as you maintain the program. |
Strength
Training Adds Bone Mass
Until recently, it was thought that after the age of 30, exercise
could only reduce the rate of bone loss. However, the latest
research performed at the Human Nutrition Research Center
on Aging at Tufts University indicates that strength training
at any age can actually add bone, not just slow its loss.
Strength training works by applying a force to the bone that
creates a stimulus for new bone formation. In
the study, women aged 50 to 70 strength trained twice a
week for a year at which time the bone density of their
hips and spine was measured. They added about 1%, while
the sedentary group had lost about 2.5% bone density. As
might be expected, the exercisers also significantly increased
their muscle strength.
Strength
training can be done anywhere using equipment as simple
as dumbbells, rubber tubing and even your own body weight.
The American College of Sports Medicine (ACSM) currently
recommends strength-training exercise be a component of
a well-rounded program for all healthy adults. The ACSM’s
recommendation is to perform 8-10 exercises 2-3 times a
week, with at least one day of rest between training. One
set of 8-12 repetitions per exercise is recommended for
general strength training benefits for people under age
50, which will take about 30 minutes to perform. One set
of 10-15 reps (more reps performed at a decreased intensity)
is recommended for people over 50 or for those with arthritis,
previous injuries, or high blood pressure .(If you have
any medical condition get your physician's approval before
starting a strength training program.)
Remember,
building strong bones, especially before the age of 20,
can be the best defense against developing osteoporosis
and that a healthy lifestyle can be critically important
for keeping bones strong. Whatever your age, you need to
make deposits into your health savings account today in
order to prevent osteoporosis later in life and enjoy an
active, physically independent lifestyle. |
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