I have a Polar heart rate monitor chest strap, and a compatible Android phone on which I can run a number of different apps for recording my heart rate. My primary interest is in how many calories I am burning during any one exercise. I play a variety of sports and run regularly.
What concerns me is that just about every app I've tried comes with an option to select a type of exercise, and then it will calculate different calorie burn rates.
Worse, these different calorie burn rates seem to be derived from a lot of assumptions about how much a person would burn doing these activities, not what I'm actually doing. As a test, I've tried connecting the heart rate monitor, choosing an activity, like "team sports" or "rock climbing", and then just standing there without moving. Regardless of the fact that I'm not actually doing anything, each app shows me burning calories fairly aggressively, as if I were engaged in that activity.
What I really want is an objective measure, something that doesn't try and make guesses based on the type of workout I'm doing, and lets me know what the most likely minimum calorie burn I am doing given my current exertion level, as measured by my heart rate. And, of course, taking in some known measurements about me, such as my height, weight, and age. Maybe GPS and pedometer as well, but whatever measurements it uses, it should be objective and not assumed.
I saw this related question, which leads me to believe that it should be possible to only use heart rate, and yet I can't find an app for Android that does that.
Is it actually not possible? Is there a reason why these apps are all making up numbers and not just going with the heart rate input?