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Fitbit Zip (top left), chest strap for heart rate and HRV monitoring... | Download Scientific Diagram
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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 Fluctuates by Age, Gender, Activity and Time of Day, Fitbit Study Reveals Heart Rate Variability Fluctuates by Age, Gender, Activity
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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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