It may balance out as well though just in the fact that all figures are estimates. This is one reason you must just try things out for a few weeks yourself and self-adjust if the results aren't as expected.
Nobody can guarantee if you burn exaclty 3,500 calories more in a week than you needed that you'll lose exactly one pound - most especially because nobody can guarantee the figures you're using for BMR, daily activity, exercise, and even food, are actually "accurate". They are ALL estimates.
Yes, the standard convention for calculating calories burned is to include the underlying metabolism calories as well. When looking at fitness, heart/lung capacity, it is the total energy demand that matters. But it does introduce a small amount of double count when looked at for weight loss purposes.
The double count is small for short, high intensity workouts (and probably less than the margin of error in a calorie ESTIMATE anyway), but yes, it is larger for longer low intensity workouts.
Perhaps you could balance this out by not tracking calories burned from strength training (an HRM will not produce an accurate estimate for strength training anyway, as it is not aerobic exercise).
When you are using a HRM the calorie burned function must take into account your BMR, activity plus the additional exertion (cardio, ST). This isn't really an issue when doing high intensity but if I do low intensity over a long time (walk for 3 hours) then my calorie burn must include my BMR, right? So my Spark calorie range will be out slightly, right? Anyone else thought about this?
My example: I do cardio for 30min at the gym (burn 300 calories according to HRM). I then do my ST programme for 60 minutes (burn 200calories). During this time my BMR plus activity would have been 112 calories (BMR 1800/24 hours = 75 calories an hour). If my calories are set to accommodate BMR and then I put the 500 calories burnt into Spark fitness then I'm double dipping on those 112 calories, right???
So I realise this is small amounts of calories but I still want to know if my musing is correct. I'm rather pedantic...
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