Hey, Jtjoray, I have run into the same type of issue. If I put the tread mill at no incline and jog/run (at about 5 mph) for 30 minutes it says I burn 294 calories, and I defitnitely feel like I've worked incredibly hard. But if I raise the incline to 10% and walk at a brisk pace (3.7 mph) for 30 mins, it says I burn 340 cals, and I definitely don't feel like I worked nearly as hard as I did when I was jogging. Unfortunately, I've never been able to find the answer as to which actually burns more calories. It would seem like I should burn more calories if I work harder. I would really love to know the answer. But until I find the answer I've decided to do what seems more challenging, rather than do what the machine tells me burns more calories. Because I know those machines are pretty inaccurate anyway--they always overestimate.
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