Thanks CdCf. I'm almost convinced. The crow is thawing, but I'm not willing to cook it just yet. You mentioned in your post that you would multiply the 260 kcals by 5 for energy used by the body; why? I couldnt determine where the 5 factor came from. Also someone please tell me how to insert part of someone elses quote so I can better direct my post. I'm such a geek, I'm still going to test this out myself on the road later this week. If I can borrow the portable calorimeter at work I can also better test the accuracy of my HRM at the same time.