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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. Interbeat interval - Wikipedia

   en.wikipedia.org/wiki/Interbeat_interval

   IBI is generally measured in units of milliseconds. In normal heart function, each IBI value varies from beat to beat. 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.

4. What Is Heart Rate Variability & How Does it Relate to Weight?

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

   Thanks to wearable devices, you can use all sorts of metrics to keep track of your health. You can check your weight, blood pressure, the number of steps you take, heart rate and more as you go ...

5. Vagal tone - Wikipedia

   en.wikipedia.org/wiki/Vagal_tone

   Frequency analysis of heart rate in the range 0.15–0.4 Hz has been reported to quantify vagal tone. [25] [36] Computation of the "power spectrum", or the ratio between the low frequency and high frequency spectral components, of heart rate variability. [7] [35] This has been used to measure the change in sympatho-vagal balance during hypnosis ...

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

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

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7. Here Are Cardiologist-Approved Ways to Lower Your Resting ...

   www.aol.com/cardiologist-approved-ways-lower...

   “So you can do things that will briefly lower your heart rate—like deep breathing and meditation—but if you are trying to lower your overall heart rate over a longer period of time, the ...