During low intensity cardio, it takes 20 min to start burning fat... BS right?

CSK

Board Supporter
I read somewhere the other day that it takes at least 20 minutes for the body to begin using fat for energy when performing low intensity cardio.

This is bullshit right? Especially if it is being performed first thing in the morning on an empty stomach or immediately post weight training. I mean if that were true, doing 30 minutes of cardio would be almost pointless.
 
Actually that is exactly the rule I use. When I do low intensity cardio I usually try to go up to 45-60 minutes. HIIT training is where its at if you want to burn fat. Try it: jog for 1 min, then go all out-balls to the wall for 30 seconds, then jog for 1 min, then balls to the wall...etc. For cutting I will do a 45 min treadmill session on a 5-7 degree incline, then do 15 minutes of HIIT. It Works!
 
would it help to burn more fat if you do low intensity for the first 20 min then bump your heart rate up after that?
 
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