![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
Fitbit Support on Twitter: "@chillin4ever086 Hi there! Your tracker measures your heart rate even when you're still or calm which refers to your resting heart rate. To know more about the heart
![How to set high and low heart rate notifications on your Fitbit Sense Series, Versa 3+, or Charge 5 - MyHealthyApple How to set high and low heart rate notifications on your Fitbit Sense Series, Versa 3+, or Charge 5 - MyHealthyApple](https://www.myhealthyapple.com/wp-content/uploads/Open-a-high-heart-rate-notification-on-Fitbit-watch-1024x768.jpg)