After a week in the microgravity of space, muscle cells age and their gene activity becomes similar to that of cells that have aged for years on Earth, a finding that may explain why muscle function is impaired during space travel.
We know that astronauts are at risk of losing bone density and muscle mass due to the extremely low gravity of space. Gun Fan Researchers from Stanford University in California and their colleagues analyzed the effects of microgravity on the genetics of muscle cells.
Source: www.newscientist.com