Originally Posted by
Shock
I think people are getting the wrong picture with the high-intensity vs. low-intensity issue. Yes, there is a greater percentage of FAT being utilized when compared to CHO during low intensity. However, when exercising at high intensity when you compare total fat being burned, it will most likely be higher than low-intensity. IMO, if you vary between the two effectivly throughout the week, you shouldn't have much concern with muscle loss. But whenever you put yourself in a negative energy balance from either diet or exercise, part of the weight loss will result in muscle loss.