i worded that badly. rather than 'convert' i should have said 'convince', meaning take on slow twitch qualities. we're in agreement.
okay
there are studies proving an increase in aerobic capacity, i'll have to dig them up. interval training increases aerobic capacity/VO2max more than endurance cardio. maximal O2 uptake, or VO2max, is regarded the best single measure of aerobic fitness.
Yes, studies will defenitly show an increase in VO2 max etc....I agree with that. However, you are missing the point I was trying to make. When you are working near VO2max levels you are working near maximum heart rate (in most cases). When you are working at Maximum heart rate you are working at a greater intensity. The intensity of an exercise will determine the metablic pathway it uses to convert energy. At higher intensities it is anerobic. At lower intensities it is aerobic. Just increasing your sprint speed, VO2max etc...Will not increase your endurance or aerobic capacity. It will increase your anerobic threshold (LA threshold) and capacity to work for shorter durations at higher intensities. For example a 100m sprinter wont be a good marathon runner. Why? Because he is not a trained aerobic athlete. See what I am saying?
the more fit one becomes, the more likely they are to use fat as fuel for any given activity.
The more fit one becomes the more fuel they will burn as their metabloic rate increases. Whether that is from glucose or FFAs is not up to the person to choose. It is up to their body to decide. A persons effeciency to burn calories is all that is important and an increase in muscle mass will do that.
post training, you burn more fat. studies have shown that HIIT can elevate your metabolic rate significantly after the workout -- w/most calories coming from fat.
Yes, oxygen debt or EPOC is the term. You are right. This happens because of the increase in oxygen uptake (to fuel the oxygen debt). It is your bodies response to trying to repair tissue and recover from training. FFAs are oxadized in the presence of oxygen.
stolen from my coach:: "Fat/calorie burning is elevated afterwards to restore homeostasis (i.e. body temperature, catecholamines, hemoglobin, myoglobin, etc.).And it doesn't matter if you eat carbs right away either. This will not inhibit the oxidation of fat. In fact research actually shows that getting nutrients in immediately after HIIT will actually increase EPOC, reduces muscle protein catabolism, and increases recovery, all while having the wonderful benefit of not inhbiting lipolysis."