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AIUI you'll burn roughly the same amount of fat in each of those zones, you'll just use more glycogen the higher the intensity.
The reason the lower intensities are better are because (a) it's easier, but (b) most importantly, by not depleting your glycogen stores as much you're less likely to over compensate with food afterwards.
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Bollocks. Sure, there's an intensity where you will burn more fat than carbs but what's the point when you can use far more total calories by exercising harder? Unless you're barely able to walk, your best bang for buck is to ride as hard as you can in the time you have available.
Calories in vs. Calories out.
You use more calories during harder exercise and you use more afterwards.
If you overcompensate by eating more, you've failed to understand Calories in vs. Calories out.
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Greenbank
hippy
@Brun
Is exercising in the 'fat-burn zone' legit or bollocks?
Over an hour on the turbo, maintaining an average HR in Z3/4/5 my work done will be 500/700/850 kJ respectively. Obviously I'm burning more calories with the greater effort, is there any truth in the suggestion that lower intensity will get rid of fat quicker? Am sceptical.