Why does inclining a treadmill burn more calories?

1 I can't speak for the center of gravity thing, but I can tell you that I'm more tired and definitely feel like my legs have worked harder when I use more incline.

2 It's true that a 3% incline on a treadmill is not the same as running up a 3% hill, for precisely the reasons you mentioned. And that's just as well: a 3% hill is actually pretty hard on a runner. But you do work harder on an inclined treadmill.

You _do_ bob up and down more, unless your running stride starts out wildly inefficient. Your front foot is now higher than your back foot. If your biomechanics are the same, you will raise your center of gravity up above where it would have been otherwise.

Before that, you had to raise your foot, and thus your leg, and to a lesser degree your whole body, higher in order to put your foot at that higher place. Your biomechanics do adjust a bit, but still, you will end up putting out more energy on the inclined treadmill.

3 I thinnk that when you don't hold on to the rails it is like walking or running uphill.

PamPerdue replied to post #3: 4 > I thinnk that when you don't hold on to the rails it is like walking or running uphill. Kind of in between. (Hold on to the rails and you can do almost no work at all, regardless of the incline.)You do have to lift your leg up a bit more, and your center of gravity bobs a bit higher on each step.

Much of the energy goes into bobbing up and down, rather than the actual forward motion. The forward motion in running should come "for free" once you have momentum, and a lot of the work comes from the sheer biomechanical inefficiency of it all.

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