Living and working in space is mentally strenuous. But the absence of gravity makes working in a spacecraft physically undemanding. On Earth, we must constantly use certain muscles to support ourselves against the force of gravity.
These muscles, commonly called antigravity muscles, include the calf muscles, the quadriceps, and the muscles of the back and neck. Because astronauts work in a weightless environment, very little muscle contraction is needed to support their bodies or move around.
Muscle atrophy is a condition in which muscles shrink and weaken. It is a common problem for astronauts who live and work in space. The lack of gravity in space causes the body to lose muscle mass and strength. This can lead to a number of problems, including decreased mobility, decreased bone density, and increased risk of injury.
There are a number of factors that contribute to muscle atrophy in space. These include:
Reduced physical activity
In the absence of gravity, astronauts do not need to use their muscles to move around. This leads to a decrease in muscle mass and strength.Changes in hormones
The lack of gravity also affects the body’s levels of hormones, such as growth hormone and testosterone. These hormones are important for muscle growth and maintenance.Oxidative stress
The lack of gravity also increases oxidative stress in the body. Oxidative stress can damage muscle cells and contribute to muscle atrophy.
There are a number of countermeasures that can be used to prevent or reduce muscle atrophy in space. These include:
Exercise
Astronauts on the International Space Station (ISS) spend at least two hours a day exercising. This helps to maintain muscle mass and strength.Nutritional supplements
Astronauts also take nutritional supplements, such as protein and creatine, to help prevent muscle loss.Drugs
There are a number of drugs that are being developed to prevent or treat muscle atrophy in space.
Muscle atrophy is a serious problem for astronauts, but there are a number of things that can be done to prevent or reduce it. By understanding the causes of muscle atrophy and developing effective countermeasures, astronauts can stay healthy and safe during long-duration space missions.
References
Space travel directly induces skeletal muscle atrophy: https://pubmed.ncbi.nlm.nih.gov/10336885/
Bone and Muscle Loss in Microgravity: https://www.nasa.gov/…/bone-muscle-loss-in-microgravity
Muscle Atrophy – NASA: https://www.nasa.gov/…/64249main_ffs_factsheets_hbp…
Mars Voyage Muscles: Don’t Like Your Workout? Try it in Space: https://www.cbsnews.com/…/mars-voyage-muscles-dont…/
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