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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. QT interval - Wikipedia

   en.wikipedia.org/wiki/QT_interval

   The QT interval is a measurement made on an electrocardiogram used to assess some of the electrical properties of the heart.It is calculated as the time from the start of the Q wave to the end of the T wave, and approximates to the time taken from when the cardiac ventricles start to contract to when they finish relaxing.

4. Heart rate - Wikipedia

   en.wikipedia.org/wiki/Heart_rate

   A medical monitoring device displaying a normal human heart rate. Heart rate is the frequency of the heartbeat measured by the number of contractions of the heart per minute (beats per minute, or bpm). The heart rate varies according to the body's physical needs, including the need to absorb oxygen and excrete carbon dioxide.

5. What Is Zone 2 Training & How It Can Support Weight Loss? - AOL

   www.aol.com/zone-2-training-support-weight...

   This is typically the target zone with high-intensity interval training (HIIT). Heart Rate Zone 5. In this zone, your heart rate will be at its peak. ... Here’s what you need to calculate your ...

6. Interbeat interval - Wikipedia

   en.wikipedia.org/wiki/Interbeat_interval

   Interbeat interval is abbreviated "IBI" and is sometimes written with a hyphen, "inter-beat interval". It is also sometimes referred to as a "beat-to-beat" 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 ...

7. QT interval variability - Wikipedia

   en.wikipedia.org/wiki/QT_interval_variability

   QT interval variability (QTV) refers to the physiological phenomenon of beat-to-beat fluctuations in QT interval of electrocardiograms. Increased QTV appears to be a marker of arrhythmic and cardiovascular death; it may also play a role for noninvasive assessment of sympathetic nervous system activity.