I used to be a member here a long time ago but have since forgotten my log-in info.
I read about it here ( I think ) a machine that you breathe into that was able to somehow determine your energy expenditure and extrapolate what your caloric maintenance requirement is.
I know that there are a couple of formulas to use but when I read about this machine it seemed to do a better job than the formula. I did in fact find and use one in 2003 and applied the data I got successfully.
The problem is that I cant remember the name and the place I used it last has since moved. Anyone remember or know the name of this machine?