Astronauts returning to Earth from an extended stay in space have to be extremely careful not to break a bone. It takes several weeks to restore normal bone strength. Which would be the best regimen to rebuild the lost bone tissue?
A) Stay inactive, avoiding exercise until the lost bone tissue is rebuilt.
B) Hit the gym and get going with a few weeks of heavy weight lifting.
C) Several weeks of swimming will rebuild all lost bone mass.
D) Start with walking and build up to jogging, with an extra regimen of light weight lifting in the gym.

Question

Quizplus · Accepted Answer

Gradual weight-bearing exercise, such as walking and jogging, can help rebuild lost bone tissue. Light weightlifting can also be added to promote bone growth. Swimming is a good exercise for overall fitness, but it is not effective in rebuilding lost bone mass. Remaining inactive will not do anything to rebuild lost bone tissue. Heavy weight lifting can be too intense and may increase the risk of injury.

Astronauts Returning to Earth from an Extended Stay in Space