Old 09-17-08, 05:38 PM
  #5  
Enthalpic
Killing Rabbits
 
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There is no distinct cutoff, it is a continuum. You can see that even at very low exercise intensity some plasma glucose is being used and at moderate intensities both muscle glycogen and plasma glucose is used. Only at fairly high intensities is the contribution from free fatty acids and muscle triglycerides reduced.

If you think about it I'm sure you can figure out a way to use IF and total KJ to come up with a good guess as to fat kcals burned.

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