Ok so i've now learned about IGF and its wonders of producing new muscle cells. But my question is this: If one was to train say white fast twitch muscle fibers vs the more abundant red Fibers Could you produce more of one compared to the other?

I understand how intensity allows for more receptors to become available so more IGF can be used in the trained muscle but what about the differnet types of fibers? Are they influenced as a whole? or can they be "built" individually with IGF?