![Fitbit Charge 4 not reading HRV and BR for past two nights. Is anyone else experiencing this? : r/fitbit Fitbit Charge 4 not reading HRV and BR for past two nights. Is anyone else experiencing this? : r/fitbit](https://external-preview.redd.it/LZerJY77eiObgeLfk7AsAdKRmLu-jpdaUkZeaqUevF0.png?width=640&crop=smart&auto=webp&s=6e63a206b2b0ca2ecd35ee8debd978a9fa1569c6)
Fitbit Charge 4 not reading HRV and BR for past two nights. Is anyone else experiencing this? : r/fitbit
![I got my Covid booster yesterday. Today my Fitbit recognized my heart rate and HRV changed and told me my body is stressed out. Just thought this was cool! I'll be resting I got my Covid booster yesterday. Today my Fitbit recognized my heart rate and HRV changed and told me my body is stressed out. Just thought this was cool! I'll be resting](https://preview.redd.it/5stm0hjzf2e81.jpg?width=640&crop=smart&auto=webp&s=81ab524a187c9c2377fe628f575d133a373e80fc)
I got my Covid booster yesterday. Today my Fitbit recognized my heart rate and HRV changed and told me my body is stressed out. Just thought this was cool! I'll be resting
![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/asset/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-2.jpg)