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Pretty much, when you run, your body cant keep up with the intensity and then naturally turns to the greatest energy source (carbs), however, what happens when carbs run out? Well naturally your wonderful body goes to the next best thing, Muscle! Muscle provides aprox 17x the energy that fat does so the body naturally relies on muscle due to cartigens(SP?) being released to bring more energy to the body part that is lacking.
However, by keeping your heart rate at a steady pace (65% aprox) your body can keep up with the intensity in a sense and instead of being forced to massively devour muscle/carbs it can rely entirely on fat once the carbs run out, pretty much, your body beleives its going to die and just like animals storing all their food as fat for when they get hungry, your body digests anything it can get ahold of for the most energy so you dont collapse dead which is carbs -> muscle/fat at high intensity
carbs -> fat -> muscle at medium intensity
Now dont get me wrong, high intensity workouts do work, why? Because you deplete your carb stores in your body so naturally all those extra carbs are then burned off and arent stored as fat like they would naturally be, however, go to long and fat isnt the only thing you are losing ...
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