Cardio hurts Leg Gains?

[oxymoron]

I like to run at least 3 times a week. Would that jack w/ my leg work outs.
If my quad day is on Monday, but then I ran on Tuesday would my recovery be dampened? Or does it matter as running is fast twitch and weights are slow twitch... hmm.

 

[Tatyana]

While we are born with a certain mix of fast and slow twitch muscle, it has been shown that different activities can cause some muscle fiber type switching (I think I read up to 30% in one paper).

So running will induce the switch or more dominance of slow twitch, which doesn't have the same capacity for hypertrophy that fast twitch does.

That is the theory at least, how much this happens in real life?

I know most competitive BBers do not run for cardio to maintain mass.

I used to run A LOT, but now I am not allowed to, unless it is HIIT as sprinting will activate more fast twitch.

 

[silver_shadow]

agreed. that seems right in line with my observations as well.

 

[GUARDIAN]

even when i am at it 6-7X ew it only affects tightness in my legs and some strength. but my size stays and it seems to bring out more veins, striations, and seperation.