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GRB 080319B
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Why is there permanent muscle loss from space travel? Is this general muscle atrophy or specific to certain muscles (i.e., which muscles don't experience permanent atrophy and why)?
GRB 080319B said:Why is there permanent muscle loss from space travel? Is this general muscle atrophy or specific to certain muscles (i.e., which muscles don't experience permanent atrophy and why)?
The Body in Space
The human body is uniquely designed to live in Earth’s gravity. In space, the body begins to adapt to the microgravity environment.
NSBRI’s science and technology program is addressing ways to reduce or eliminate many of the changes to the body that impact an astronaut’s ability to perform well in space and that might impact their health after returning to Earth. The NSBRI program also looks at ways to enhance countermeasures already in place on long missions.
Here’s a quick introduction to how the body reacts to life in space [. . .]
Muscles
Extended spaceflight results in less load on the leg muscles and on the back’s muscles used for posture. As a result, the muscles can begin to weaken or atrophy, and this could lead to fall-related injuries and accidents during exploration missions. Astronauts currently exercise to help maintain their muscle mass, but nutritional interventions designed to reduce the muscle loss may one day be added as a complement to the exercise program.
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Please read on . . .
http://www.nsbri.org/DISCOVERIES-FOR-SPACE-and-EARTH/The-Body-in-Space/
The lack of gravity in space leads to a decrease in muscle usage, causing muscle atrophy. Without the constant pull of gravity, the body does not need to work as hard to support itself, resulting in muscle loss.
Studies have shown that significant muscle loss can occur in as little as 2 weeks in zero-gravity conditions. However, the rate of muscle loss may vary depending on the individual's overall health and level of physical activity.
While it is difficult to completely prevent muscle loss in zero-gravity, regular exercise and resistance training can help maintain muscle mass. Astronauts on the International Space Station also use specialized equipment, such as treadmills and resistance machines, to help combat muscle atrophy.
Yes, muscle loss in zero-gravity can have long-term effects on an individual's physical abilities. It can lead to decreased strength and endurance, as well as an increased risk of injury once returning to Earth's gravity.
NASA has developed specific exercise programs for astronauts to follow during their time in space. These programs include a combination of cardiovascular and resistance training to help maintain muscle mass and prevent bone density loss. Astronauts also undergo a rigorous physical rehabilitation program upon their return to Earth to help rebuild any lost muscle mass.