ENTITY Fitbit Charge 4

Fitbit Charge 4

PulseAugur coverage of Fitbit Charge 4 — every cluster mentioning Fitbit Charge 4 across labs, papers, and developer communities, ranked by signal.

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TOOL · CL_335287 · Nov 1 · 16:45

Fitbit HRV tracking explained: What your data means

Fitbit devices, now integrated with Google Health, measure heart rate variability (HRV) using the root mean square of successive differences (RMSSD) method, primarily during sleep. This metric reflects the body's respon…