Starfish, I also have a couple of self-tests. PM me if you want me to send them to you. The ones I have are from Chris Carmichaels's Food for Fitness book. With his method, he has the person do some specific high intensity cycling (or running) sequences and uses average heart rate to determine heart rate intensities that correspond to training different energy systems. He uses AHR because they're indicative of a true response to the entire duration of the effort.

If Eden has seen this one, she may be able make more of a comment on as a comparison of other self-tests.