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In figure 2 we see that at 30% VO2max you are burning about 70% carbs or 45g/min and about 30% fat or 9g/min fat. At 70% VO2max your carbohydrate use increases to about 80% (135g/min) and the contribution to energy supply from fat drops by about 10%. However, the total amount workout program fat burned per minute increases to 12.6g/min about a 30% increase. So what about total calories? Well in figure 3 we can see over a 45 min exercise period the total caloric expenditure from fat and carbs combined is a massive 60% during higher workout program intensity (70% VO2max) vs. workout program low intensity (30% VO2max) exercise. [figure 2] [figure 3] Therefore the suggested maximal fat burning zone is about 60-65% of VO2max or 70-75% of Max heart rate. This data is from a real subject and I have included 2 other figures (Fig.4 & 5) so that you can see where in this subject fat oxidation reaches it maximum and carbohydrate oxidation is still on the increase.
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