Sounds like you're saying if you took 2 people , and they had all other things being equal, except one of them had some post workout nutrition within 15 minutes of completing exercise and the other one didn't have any post workout nutrition till after 45 minutes of completing exercise, the latter would burn more fat.
Any idea how many more calories ( i.e % more etc. ) the person who had some post workout nutrition 45 minutes after exercise would burn versus the person who had some post workout nutrition 15 minutes after exercise?
What I'm saying.....is that I've read and studied some research that suggest that our bodies will continue to oxidize fat while blood-sugar is low....and it's been suggested that by holding-off on eating, we can squeeze a bit more fat-burning in. What I've read goes like this:
When you first start to exercise you immediately start burning/using the glucose in your blood and glycogen stored in the liver & muscle. After about 20 minutes of exercise your body will start to open-up and draw on fat-reserves IN COMBINATION with glycogen. We're not like an airplane where we can select which fuel tank you draw from; it's a combination of fuels at all times.
If we're not eating during exercise, the body is drawing on glycogen reserves and fat. Our bodies are trying to maintain a blood-sugar level. You and I know when the game is over, but our bodies don't...the moment that whistle blows we stop playing and start pouring the Gatorade ON YOUR HEAD, but our bodies are still at work oxidizing fat and bringing-up the rears with what it anticipates will be more exertion.
I've had a few trainers tell me, and a nutritionist agree to some extent, that the moment we eat something (like some oranges or gel), our blood-sugar will go up..and the moment the body senses the blood-sugar is normal or higher then normal: fat oxidation gets dramatically shut down. I was told to wait 30minutes to one hour before eating just to keep the body in a blood-sugar deficit and burn-up some more fat.
It's a theory Wrangell, nothing more. They did not suggest this for weight-training.....for weights they said the sooner the better...hit it with carbs and especially protein. But for cardio, you can play the hold-off scheme.
How many calories? Good question. Well, when I exercise my HR-monitor suggest that I'm burning about 35-40% of my calories derived from fat, but that's when I'm pumping away. Once we stop exercising our heart-rates fall and I'd guess we're back to our RMR of say 100-calories per hour. As you mentioned, we burn more fat% at a lower exertion (figure 60%), so I'm guessing waiting 45 minutes might be good for about (100 calories x .60 x 45 minutes)...all of 27 additional calories...and that doesn't account for what you'd still be burning even if your sugar goes up. In all it seems rather negligible....BUT still, the theory suggest and purports that you can leave your body in a greater percentage of fat-burning by letting it continue metabolizing fat anticipating more exercise...instead of chugging the fruit-juice and (not entirely, but substantially) reducing fat oxidation.
But again, the other theory suggest that eating will fire-up the furnace even more and you'll have a greater thermogenic response. I've noticed that after eating a good meal (post exercise) I sometimes can feel even more heat coming off my body then had I not eaten much. So here again is another theory that suggest the opposite....to eat.
Are you saying all insulin spikes cause fat storage after exercise ?
Doesn't insulin induced fat storage primarily occur when your glycogen tanks are full...which clearly...they wouldn't be anywhere close to being full after a soccer game would they ?
Insulin spikes are supposed to cause A MORE RAPID absorbtion of glucose into the body. Your body will assimilate the glucose faster. After exercise you certainly would have some serious openings for replenishing pf lost/depleted glycogen reserves!
Your query is OUTSTANDING...where does the glucose flow? Will it entirely go into glycogen storage first and only then go to fat?....or does it enter into both at the same time? Thank you, you've given me my first question when I next see Alan! (I love playing stump the nutritionist

). But at the same time, Alan told me it's "impossible" for your body to store or add to fat after you've exercised, which is entirely why it's prime-time to eat after exercising....but what if you've used 800 calories of stored glycogen and just ate 1,400 calories of food?? Something has to give.......no?
The only thing I find consistent is this: you can ask 3 different nutritionist and get 3 different answers. You'd think it's the science of nutrition, but it seems more like the practice. Research offers different supporting info and nobody wants to risk looking like they don't have the answers. I can think of at least 3 different people on this forum who do this for a living...yet they won't address this issue for fear of looking less then expert! I don't blame them.
I'll see what I can find out from Alan...he tends to back his stuff up with some pretty serious clinical studies where they draw blood, analyze things to no end and really get into it. Anything else you'd like to question? Sometimes I wonder if you're trying to make me realize I'm wrong about something, or if you're really asking from genuine uncertainty. I think the latter. Gosh it must be fun to pour Gatorade on your head!
