
Originally Posted by
MuscleScience
I think hit is superb at building muscle. It stimulates fast twitch and intermediate twitch fibers and raises your natural GH pulse during and after exercise to an incredibly high level. It also helps create a very negative oxygen debt load very rapidly, that the body must "repay," by boosting metabolism. After HIIT your body will be in a high beta oxidative state (burning fat) for upto 36 hours and GH elevated up to 48 hours. Steady state exercise you get that effect for maybe 8-12 hours after. This is called Post Exercise Caloric Expenditure or Post exercise oxidative expenditure. I've seen it both ways on varies journals if you want to read up on it further. It's one of my favorite areas of exercise physiology that I still enjoy keeping up with. My legs probably got the best cuts out of all my training regimes I've done since switching to more HIIT training.