Probably not, as the reality is each manufacturer uses their own patented algorithms that take into account the workload and duration of the exercise. Some equipment manufacturers do research to validate these formulas on a number of subjects. The higher-end the machine, the more likely it is to use a validated formula. A newer version of the same machine might even have a different formula in an attempt to improve its accuracy (if you have an older model and want to make sure you’re using the most updated formula, you can call the manufacturer who might be able to walk you through the upgrade over the phone). Some formulas are based on the principle that during exercise, heart rate has a linear relationship with oxygen consumption, which can be easily converted to determine the number of calories burned. However, heart rate is influenced by a number of things such as temperature, body position, food intake, muscle groups exercised, some medications, and whether the exercise is...
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