survivorjb2003 wrote:
Unfortunately, no. How the body uses energy goes like this:
First, it uses up stored glucose in the muscles. This goes fairly quickly.
Then, the liver uses its stored glycogen. After about 10-20 minutes, this reserve is gone.
After that, your body uses a mixture of fat and protein and any sugars it can find for energy. Fat is harder to utilize for energy and thus it is spared as much as possible.
When you are in the fat burning zone, the body is utilizing primarily fat at the largest proportion for energy. Above that, and it starts to shunt to protein and any glucose it can find with the proportion of fat falling.
Also, if you fast for 48 hours to try and lose weight....your body will primarily eat the muscle first. Sorry for the anorexics...it doesn't work.
Actually, I'm not sure that's right. The energy in our body is called ATP (adenosine triphosphate). We replenish used ATP supplies using 3
biochemical pathways: aerobic system, anaerobic system and the creatine phosphate system. When we start working out we are in the aerobic phase which is
composed of fatty acids (Fat) and glucose. Most of the ATP the body produces is made up from Fat and carbohydrate (glucose).
When we get to the point of exercise when we're short on breath (less oxygen to the cells) we go anaerobic (without oxygen). The anaerobic threshold
generally occurs in the range of 50 to 85% of your maximum effort. The primary source of anaerobic ATP production is carried in the blood and also stored in
muscles and the liver as glycogen.
Finally, there is an extremely limited supply of creatine phosphate. Probably only enough to last for about 10 seconds of maximum effort.
Remember fat yields 9 calories of energy per gram, while carbs (glucose) and protein only yield 4 per gram.
So to end this insanely long post, what Survivorjb posted is wrong... you use more fat when you workout.
