RE: Evidence that running and walking have the same calorie burn
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I don't know how these apps calculate the calories. It has to be an estimate. It's the number I don't worry too much about. I do think it's good if people can feel they are achieving something within their limits.
It might be interesting to do several workouts of exactly the same length at a range of paces. I'm sure someone has done this with different apps. I use the Garmin one and Strava, but don't look much at Garmin.
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I remember reading something online about how none of the sports watches can actually give anyone an accurate readout of calories burned. To do that requires some really expensive and technical equipment that only labs or really expensive hosptials would have.
I would imagine that it is just a rather crude estimate based on weight, age, heart rate, and distance... which is probably good enough.