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Is FItbits HRV algorithm validated?

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‎08-16-2023 13:57

‎08-16-2023 13:57

Looking to find a white paper/published paper/blog post about the HRV or ECG detection/algorithm to see if it has been validated against a ground truth device. Specifically, HRV during sleep. I've found multiple sleep-stage and HR validation papers, but none on HRV for any Fitbit band. Has this been validated?

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