1) Let me get this straight.....sprinting in itself builds muscle?
2) You believe in the so called "Afterburn effect"? I know this is the theory, but I have my doubts (and have read things that call this claim into question).
Running long distance builds muscle just as sprinting does. They stimulate slow / fast fiber development. That is building muscle. If you have never done a workout in your life and do nothing but long distance running for a year. You will build muscle. It doesn't always mean becoming huge. Sprinters develop more explosive / resistance muscle by sprinting alone. You get stronger so you can push yourself harder / faster. Long distance running your muscles become more efficient. You aren't continuously pushing them to their limit like you are sprinting.
And yes I do believe in the afterburn effect. The science (logic) seems sound and I always do cardio with my HR monitor. I used to make diaries and logs but now I just watch it mostly for fun. I don't know what crazy afterburn advocates argue in terms of calories. All I know is that you will burn more calories after your intense sprint workout than you will a steady state run. In the scheme of things I think thats meaningless to the calories you burn while working out.
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