This makes it harder for muscle cells to build new muscle proteins. (cathe.com)
But when your body is in a predominantly catabolic state, gaining muscle is not a priority, and the synthesis of new muscle protein is substantially reduced. (fitnessandpower.com)
It activates a muscle - building pathway called mTOR (mammalian target of rapamycin), a pathway that turns on the «machinery» that synthesizes new muscle protein. (cathe.com)