Muscle loss during casted healing

AmandaLY17

I broke my ankle two weeks ago and now have my foot in an aircast. Is there any way to limit muscle loss while healing? Does one even lose that much muscle? Already (8 days in cast, 14 since break) the calf in question seems to be visibly smaller than it's counterpoint but could I be imagining it? (I can see it as I remove the cast for showering) I've been steadily losing weight since Feb and that makes me happy but I'm worries about losing too much muscle now.