polar has a lot of very accurate tests, such as running test, leg recovery test, daily morning hrv test (including lying down test and standing test), and recovery data and sleep ans data (I think more accurate than garmin battery algorithm), polar normal synchronization of third-party app can only synchronize activity data, polar is to provide api service, I do not know if intervals can apply to read hrv these data? Or use a more convenient way to synchronize?
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I have already created an Intervals.icu app for the Polar API and will do that work at some point. I had a brief look and I can get sleep, HR, HRV and some readiness like info.
You might be able to get some of that to sync to Intervals.icu already via Google Fit.
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