I've seen some sports watches measure VO2 max. How do they do this? Do they create their own formula, or do they use a preexisting one?
Md Ariful Islam
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Dr. Md Rushad Rahman
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They tend to use the Firstbeat method, which was patented in 2012. It uses segments of the GPS tracking data and/or power data from the sports watch along with HR measure to estimate VO2 max. It's been shown to be ~95% accurate compared to lab testing using inhaled/exhaled gas analysis.
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