will you lose muscle mass? and will you have enough muscle mass to be able to walk when you wake up? and how much can you use your arms? if your a boy
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I'm not entirely positive, but I'm sure that you would lose quite a bit amount of muscle mass and that once someone finally woke from a coma they would have to go into extensive rehabilitation, especially for being in a coma for four years. Your body isn't moving at all, it's not doing anything to maintain the muscle mass or to increase it.