I'll add that the "catecholamines" referenced in the story are likely epinephrine (adrenaline) and norepinephrine, both of which are secreted in significantly higher amounts during intensive exercise. These hormones have the effect of, among many other things, stimulating the breakdown of glycogen to glucose in liver and muscle, and the release of free fatty acids from fat stores for use as energy. So the scientific logic here is very sound.
Here's a link to another related story on interval training and fat burning: http://www.sciencedaily.com/releases/2007/06/070627140103.htm
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