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2. Heart rate variability - Wikipedia

   en.wikipedia.org/wiki/Heart_rate_variability

   Heart rate variability visualized with R-R interval changes Electrocardiogram (ECG) recording of a canine heart that illustrates beat-to-beat variability in R–R interval (top) and heart rate (bottom). Heart rate variability (HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the ...

3. Fitness tracker - Wikipedia

   en.wikipedia.org/wiki/Fitness_tracker

   The Fitbit Charge 3 activity tracker. A fitness tracker or activity tracker is an electronic device or app that measures and collects data about an individual's movements and physical responses, towards the goal of monitoring and improving their health, fitness, or psychological wellness over time.

4. Fitbit Charge 6 brings better heart rate tracking and deeper ...

   www.aol.com/finance/fitbit-charge-6-brings...

   Fitbit is rolling out the latest version of its top-of-the-line fitness tracker: the Charge 6. Available Oct. 12 for $159, the Charge 6 comes with updated heart rate tracking that promises ...

5. All About Heart Rate Variability and How Tracking It Might ...

   www.aol.com/lifestyle/heart-rate-variability...

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6. Interbeat interval - Wikipedia

   en.wikipedia.org/wiki/Interbeat_interval

   This natural variation is known as heart rate variability (HRV). However, certain cardiac conditions may cause the individual IBI values to become nearly constant, resulting in the HRV being nearly zero. This can happen, for example, during periods of exercise as the heart rate increases and the beats become regular.

7. List of Fitbit products - Wikipedia

   en.wikipedia.org/wiki/List_of_Fitbit_products

   Fitbit Alta HR fitness tracker wristband showing heart rate monitor display. The Fitbit Alta [41] was released in February 2016. The wristband offers a full OLED screen that can be tapped for reminders, a clock and smartphone notifications. While not a touch screen, it is interacted with by tapping the band, similar to previous models.