quote:<HR>Originally posted by CSuzette:
I was looking at my Coe running book and getting rid of most of it...but I saved pages approximatley 55-75. That's the part that talks about aerobic vs anaerobic and fat burning vs. glucose burning energy. I finally found the formulas that I was looking for that clearly shows that by burning fat you produce more ATP with less oxygen required.

I will try to remember to post it this week.<HR>

quote:<HR>
Research conducted at the Karolinska Institute in Sweden during the 1980s showed that, within the leg muscles of highly trained endurance men, the activity of enzymes that break down fats was 100 percent higher than in the untrained subjects. As a result, during exercise they had a much higher ability to regenerate the ATP that fuels muscular contraction than those who had a greater reliance on carbohydrates...

Initially, studies found that high-fat diets, where fats supply 60 percent or more of the calories, showed promise as a means to better endurance. Fat burning is increased on high-fat diets, even at rest. Exercise tests showed higher endurance in subjects who had been eating high-fat diets in comparison with high-carbohydrate diets.

At issue, however, was the intensity of exercise used for the tests. High-fat diets improved endurance at relatively low-intensity levels. When the intensity was increased to mirror race situations, the advantage disappeared. The higher- intensity exercise required more carbohydrate, and the subjects simply lacked adequate glycogen to continue for extended periods. The lesson is that you can reduce your reliance on carbohydrate, but you can't eliminate it. <HR>