Bodybugg vs HRM for Weight Training

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According to my bodybugg, I burned the same calories doing 30 minutes of Jillian Michael's Body Revolution as I did on a 45 minute (very) leisurely stroll with my dog. That can't be right, can it?

I know HRM's have a hard time accounting for weight-training routines since your heart rate doesn't increase so much, but do bodybuggs also have the same problem? I don't really know how they work....

I was sweating and huffing and puffing doing the workout, so it seems like I should have burned more than a walk's worth of calories. Any ideas?