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Fitbit Charge 4 not reading HRV and BR for past two nights. Is anyone else experiencing this? : r/fitbit
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Sensors | Free Full-Text | HRV Monitoring Using Commercial Wearable Devices as a Health Indicator for Older Persons during the Pandemic
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Fitbit shows weird data. HRV nose dive in one night and shows that I did intense activity although I didn't. What could be the issue? : r/fitbit
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Heart rate variability with photoplethysmography in 8 million individuals: a cross-sectional study - The Lancet Digital Health
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