Is There a Shift in the Fast Twitch?

Long term, it's possible that the light weight high rep may cause more slow twitch shifts. With heavy lifting, you might not get a shift in the fast twitch direction. I think if we're looking for shifts, it's more about what you remove compared to what you add. So i don't know if that's fact, but that's what intuition would tell you. If you're interested in the talk on on fasts, which we have a whole podcast on this, episode four with doctor galpin, that is a great episode.