How do heart rate monitors count calories?
They don’t. They measure heart rate, and that’s it.
They estimate calories burned by using an estimated relationship between heart rate (HR) and oxygen uptake (
Most people don’t know their
They try to calculate your rate of caloric expenditure using variables such as gender, heart rate, weight, and age (which are related to
Typical formulas for calories might be:
If you wore four different watches, you would probably get four different readings.
And just because the watch on your wrist says you burned 1 000 calories, it isn’t necessarily true.
There could be a margin of error of as much as ±50 %.