![Fitbit study finds heart rate variability fluctuates by age, gender, time of day and activity level | MobiHealthNews Fitbit study finds heart rate variability fluctuates by age, gender, time of day and activity level | MobiHealthNews](https://www.mobihealthnews.com/sites/default/files/Fitbit_Versa_3_Lifestyle_Park_Jog_Pink_Clay_OTS_Connected_GPS_MH_0307.jpeg)
Fitbit study finds heart rate variability fluctuates by age, gender, time of day and activity level | MobiHealthNews
![HRV score had me mildly freaking out. Reddit search showed others with the same concern. Syncing data with Healthzilla and doing their finger scan has me feeling a bit more optimistic : HRV score had me mildly freaking out. Reddit search showed others with the same concern. Syncing data with Healthzilla and doing their finger scan has me feeling a bit more optimistic :](https://preview.redd.it/isjopuivcy181.jpg?width=640&crop=smart&auto=webp&s=ada28ac3aee0673b2e4115694cb1bd3946a7064d)
HRV score had me mildly freaking out. Reddit search showed others with the same concern. Syncing data with Healthzilla and doing their finger scan has me feeling a bit more optimistic :
![Heart rate variability with photoplethysmography in 8 million individuals: a cross-sectional study - The Lancet Digital Health Heart rate variability with photoplethysmography in 8 million individuals: a cross-sectional study - The Lancet Digital Health](https://www.thelancet.com/cms/attachment/0d649219-4f2f-4f2c-98b9-1e19ceb29c48/gr1.jpg)
Heart rate variability with photoplethysmography in 8 million individuals: a cross-sectional study - The Lancet Digital Health
![Heart Rate Variability Fluctuates by Age, Gender, Activity and Time of Day, Fitbit Study Reveals Heart Rate Variability Fluctuates by Age, Gender, Activity Heart Rate Variability Fluctuates by Age, Gender, Activity and Time of Day, Fitbit Study Reveals Heart Rate Variability Fluctuates by Age, Gender, Activity](https://www.wearable-technologies.com/wp-content/uploads/2020/12/Fitbit-heart-rate-variability-study-1.jpg)
Heart Rate Variability Fluctuates by Age, Gender, Activity and Time of Day, Fitbit Study Reveals Heart Rate Variability Fluctuates by Age, Gender, Activity
![Heart rate variability with photoplethysmography in 8 million individuals: a cross-sectional study - The Lancet Digital Health Heart rate variability with photoplethysmography in 8 million individuals: a cross-sectional study - The Lancet Digital Health](https://www.thelancet.com/cms/attachment/97354905-4b22-4a44-8102-276a68fd46d6/gr2.jpg)