SOLAR SYSTEM

Detailed explanation-1: -Astronauts take bisphosphonate once a week to prevent bone loss in space.

Detailed explanation-2: -To reduce bone loss, astronauts must exercise for a minimum of 2 hours per day. On Earth, the best way to build bone mass is by taking part in load-bearing activities, such as walking, running, and playing basketball.

Detailed explanation-3: -In-flight exercise-resistance training on the space station-proved important for preventing muscle and bone loss. Astronauts who performed more deadlifts compared to what they usually did on Earth were found to be more likely to recover bone after the mission.

Detailed explanation-4: -Bone loss occurs in the weightless environment of space because bones no longer have to support the body against gravity. On Earth, gravity applies a constant mechanical load to the skeletal system, that causes healthy bones to maintain a certain density so that they are able to support the body.

Detailed explanation-5: -In that environment, an astronaut’s anti-gravity muscles aren’t active during normal activity. Astronauts exercise up to 2.5 hours a day on the International Space Station to combat muscle atrophy, by riding a stationary bicycle, walking or jogging on a treadmill, and by using a RED (Resistance Exercise Device.)