How bad is steady-state cardio in regard to losing muscle?

[ikeNball]

Specifically running. I don't ever go over 3 miles @ a time. I run between 6:45-7:45 average mile.
While I have seen drastically better results (retaining muscle/fat loss) by doing HIIT running on the treadmill, I enjoy the mental benefits of running outside. I take BCAA pre-run (currently Scivation Xtend). Your thoughts/advice greatly appreciated !

 

[bdcc]

My research review, with references.

 

[Mystere3]

If you like to run then run... Improving your cardiovascular health isn't going to hurt you. Just eat and you won't lose much muscle.

 

[waynaferd]

Running and swimming are probably the worst for trying to keep muscle, unfortunately.

 

[nicksox15]

It's not going to make you whittle away or anything, just make sure to eat enough!

 

[mountainman33]

Improving your cardiovascular health isn't going to hurt you.

This is always a good thing. I've been doing various forms of HIIT and it has improved my cardio health immensely. There are things that I used to get winded with that are easier now by far since beginning HIIT.