New treadmills

We have new treadmills at our gym. Not sure why, the old ones seemed fine to me, and not so old really. But when I turned up on the weekend they had replaced them all. Anyway, the new treadmills are not only nice and shiny, they also give you a readout of your heart rate. So I was finishing up last night and I decided to see what mine was, and was surprised to see it was at 182. I don't know a lot about this sort of thing, but that seems really high to me. Like in danger of going into cardiac arrest high. According to the calorie counter I burned almost 1,100 calories during the course of the run, which again, seems like an awful lot. I'm not sure if the machine is lying to me to make me feel good about myself, I would like to think that it has more integrity than that.