Thanks Ross. You said alot of what I was going to say. I'll still add in some things though
The whole thing about heavy strain on skinny athletes is something that I will leave alone.
Yes, glycogen is being depleted and like Ross said a good pre/post workout plan will stave off catabolism. What is the difference between sprinting and weight training? As far as my muscles are concerned there really isn't one (given that my muscles are exerting the same contraction force for the same amount of time, in both sprinting and weight training).
What about the carryover? Maybe sprinting will affect my squats because I'm accumulating fatigue in my legs and that fatigue will affect my ability (ability will decrease but my strength will not decrease), what about bench? Will sprinting affect my pressing ability?
If the problem can be solved by drinking a protein shake mid-workout (sprinting or weights) then its really not zapping anything, especially strength. A decrease in ability does not mean there has been a decrease in strength.
Ross is right, I've read the HIIT article already. Many many years ago
