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Old 10-21-21, 06:37 AM
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Originally Posted by MoAlpha View Post
Yup. I believe most wearables use an algorithm based on HR response to exercise and a set of population tables for age and sex. They derive a relationship and estimate the max, based on submaximal data. Probably accurate within a few points in most people.
Weight, too, but yeah, sounds about right.

Not surprisingly, my new Fitbit, which seems to do a poor job of reading HR on a bike ride outdoors, dropped my Fitbit VO2max estimate by 4 points or so. Bastards.
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