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2. Heart rate - Wikipedia

   en.wikipedia.org/wiki/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 .

3. Cardiac cycle - Wikipedia

   en.wikipedia.org/wiki/Cardiac_cycle

   Assuming a healthy heart and a typical rate of 70 to 75 beats per minute, each cardiac cycle, or heartbeat, takes about 0.8 second to complete the cycle. [ 2 ] [ 3 ] Duration of the cardiac cycle is inversely proportional to the heart rate.

4. Cardiac output - Wikipedia

   en.wikipedia.org/wiki/Cardiac_output

   Cardiac output (CO) is the product of the heart rate (HR), i.e. the number of heartbeats per minute (bpm), and the stroke volume (SV), which is the volume of blood pumped from the left ventricle per beat; thus giving the formula: = [3] Values for cardiac output are usually denoted as L/min.

5. How many heartbeats do you have in a lifetime? Here's ... - AOL

   www.aol.com/many-heartbeats-lifetime-heres-know...

   For example, in someone 20 years of age, 200 beats per minute (bpm) is typical, with a range of 190 to 220, although 220 would be quite high and rare. For someone 60 years of age, the HRmax would ...

6. Sinus rhythm - Wikipedia

   en.wikipedia.org/wiki/Sinus_rhythm

   Normal heart rate (classically 60 to 100 beats per minute for an adult). Regular rhythm, with less than 0.16-second variation in the shortest and longest durations between successive P waves; The sinus node should pace the heart – therefore, P waves must be round, all the same shape, and present before every QRS complex in a ratio of 1:1.

7. Heart - Wikipedia

   en.wikipedia.org/wiki/Heart

   The adult resting heart rate ranges from 60 to 100 bpm. The resting heart rate of a newborn can be 129 beats per minute (bpm) and this gradually decreases until maturity. [50] An athlete's heart rate can be lower than 60 bpm. During exercise the rate can be 150 bpm with maximum rates reaching from 200 to 220 bpm. [8]