i can see real medical uses for this as well, but having this sold at retail will just fill up emergency rooms and doctor offices with hypochondriacs wondering why their heart rate is
Funny. It the world I live in, I had to explain to my doctor that the 1% change in my total cholesterol had more to do with the time of day my blood was taken than changes I'd made during the entire previous year. I've no idea why she focused on my total level, since the test listed HDL and LDL. In the debate on giving patients more information, I don't agree with the doctors. I've had to diagnose the majority of my health problems (all later confirmed by the doctor), because most doctors don't take the time to ask the right questions. Without some research, I don't know that one of fifty different things happening to me is relevant. I think my favorite time was when another doctor in an annoyed voice said, "Your self diagnosis is correct. You do have a hernia." I would have loved to been wrong about that one.
It sounds as though medicine is like everything else: you have a better experience when you take a little initiative and work _with_ the experts instead of being completely passive, waiting for someone else to do absolutely everything for you.