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I've read a few articles that have said the same thing and I think that it is true. I don't think there is any way to get a more accurate reading about shaking. I tried looking up shaking, shivering and trembling and the best thing I got was the extra calories you burn trembling during sex, which a thought was a lot of hooey. I would not worry about counting the calories for the shaking, I was just consider it an extra bonus added to whatever other activities you participate in.