Muscle gain and cardio

[tuttle]

Why does increased cardio/aerobic work go against gaining muscle? (how) as after increasing my non-weight training, gains slowed and reversed.
How much cardio would anyone recommend as maximal limit before effecting gaining muscle?

Any help would be really welcome (from a naturally gifted endurance athlete trying to gain mass)

Tuttle

[IGF-1]

well when you do cardio your body is burning calories, and one of its favorite sources of energy is muscle tissue so it will start to eat away at your muscle. I generally do it 3x a week for 30mins

[Orange357]

Just eat before cardio to spare muscle then..