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NASA Study Provides New Findings On Protecting Astronauts' Bones Through Diet And Exe
#1
HOUSTON
-- Eating the right diet and exercising hard in space helps protect
International Space Station astronauts' bones, a finding that may help
solve one of the key problems facing future explorers heading beyond low
Earth orbit.

A new study, published this month in the
Journal of Bone and Mineral Research, evaluated the mineral density of
specific bones as well as the entire skeleton of astronauts who used the
Advanced Resistive Exercise Device (ARED), a 2008 addition to the space
station that can produce resistance of as much as 600 pounds in
microgravity. Resistance exercise allows astronauts to "lift weights" in
weightlessness.

Researchers compared data measured from 2006
until the new device arrived, when astronauts used an interim workout
that offered about half the total resistance of the ARED. The
researchers found astronauts using the advanced exercise system returned
to Earth with more lean muscle and less fat, and maintained their whole
body and regional bone mineral density compared to when they launched.
Crew members using ARED also consumed sufficient calories and vitamin D,
among other nutrients. These factors are known to support bone health
and likely played a contributing role.

"After 51 years of
human spaceflight, these data mark the first significant progress in
protecting bone through diet and exercise," said Scott M. Smith, NASA
nutritionist at the agency's Johnson Space Center in Houston and lead
author of the publication.

Since the 1990s, resistance
exercise has been thought to be a key method of protecting astronauts'
bones. Normal, healthy bone constantly breaks down and renews itself, a
process called remodeling. As long as these processes are in balance,
bone mass and density stay the same. Earlier studies of Russian Mir
space station residents found an increased rate of breakdown, but little
change in the rate of regrowth that resulted in an overall loss in bone
density. In the new study, researchers looked at preflight and
postflight images of bone using X-ray densitometry, as well as in-flight
blood and urine measurements of chemicals that reflect bone metabolism.
In crew members who used the ARED device during spaceflight, bone
breakdown still increased, but bone formation also tended to increase,
likely resulting in the maintenance of whole bone mineral density.


"The increase in both bone breakdown and formation suggests that the
bone is being remodeled, but a key question remains as to whether this
remodeled bone is as strong as the bone before flight," said Dr. Jean
Sibonga, bone discipline lead at Johnson and coauthor of the study.
Studies to evaluate bone strength before and after flight are currently under way.


Beyond bone strength, further study is required to determine the best
possible combination of exercise and diet for long-duration crews.
Dietary effects on bone are being studied on the space station right
now, with one experiment evaluating different ratios of animal protein
and potassium in the diet on bone health. Another is looking at the
benefits for bone of lowering sodium intake.
source :nasa news services

در مورد اظهار نظر آقایون در تاپیک دلخوری باید بگم:
آقایون: کم گوی و گزیده گوی چون در// تا ز اندک تو جهان شود پر!!!
هرچند ک کلام گوهر بار از زبان شما جاری نشده، نمیشود و نخواهد شد!!!
پاسخ
 سپاس شده توسط crux
#2
دوستان نظری در مورد اینجور پستا ک براتون میذارم ندارین ؟

انتقادی ، پیشنهادی اگه داشته باشید استقبال میکنم
ممنون
در مورد اظهار نظر آقایون در تاپیک دلخوری باید بگم:
آقایون: کم گوی و گزیده گوی چون در// تا ز اندک تو جهان شود پر!!!
هرچند ک کلام گوهر بار از زبان شما جاری نشده، نمیشود و نخواهد شد!!!
پاسخ


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