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I'm curious, have you explored compatibility with other hardware as well, like the Polar H7 or even other types of physiological monitors? We've conducted a study comparing Aidlab physiological monitor’s accuracy of heart rate variability measurements with the Polar H7 and found a high correlation in the data. It would be interesting to know how your app performs when paired with various hardware.

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The H10 is the gold standard for HRMs and the one most commonly used by anyone doing experimentation with HRV. I don't have the specs memorized off hand, by my recollection is that it does a better job of capturing the entire waveform.

Yep that's right, and the H10 is able to stream the ECG waveform. For this project I used the inter-beat-interval that is sent however, as it means I don't have to run peak detection on the ECG to get heart rate.

The H10 is a newer and better version of the H7. Because breathing rate is measured from chest expansion that is pretty easy to verify (there can be noise in the estimate of course due to movement artefacts). Heart rate estimation from the H10 is widely considered to be reliable, The H10 also offers to ability to stream the raw ecg to check this.

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