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2. Heart rate - Wikipedia

   en.wikipedia.org/wiki/Heart_rate

   The normal range has since been revised in textbooks to 50–90 bpm for a human at total rest. Setting a lower threshold for bradycardia prevents misclassification of fit individuals as having a pathologic heart rate. The normal heart rate number can vary as children and adolescents tend to have faster heart rates than average adults.

3. What’s the Difference Between a Normal and Dangerous Heart Rate?

   www.aol.com/difference-between-normal-dangerous...

   A “normal heart rate” for adults ranges from 60-100 beats per minute ... A resting heart rate greater than 100 bpm in adults should be discussed with a healthcare professional to identify the ...

4. Heart rate variability - Wikipedia

   en.wikipedia.org/wiki/Heart_rate_variability

   [39] [40] This heart rate variation is directly caused by the central respiratory rhythm, faithfully tracks the respiratory rate across a range of frequencies and is a major cause of heart rate variability in humans (Cooper HE, Clutton-Brock TH & Parkes MJ (2004). Contribution of the respiratory rhythm to sinus arrhythmia in normal ...

5. Bruce protocol - Wikipedia

   en.wikipedia.org/wiki/Bruce_protocol

   The Karvonen method factors in resting heart rate (HR rest) to calculate target heart rate (THR), using a range of 50–85% intensity: [9] THR = ((HR max − HR rest ) × %Intensity) + HR rest Example for someone with a HR max of 180 and a HR rest of 70:

6. Your resting heart rate can tell you a lot about your health ...

   www.aol.com/finance/resting-heart-rate-tell-lot...

   Those are times to seek out help because it may not be a reflection of your resting heart rate, but an abnormal heart rhythm that should get evaluated.” Having a pulse over 100 bpm is called ...

7. Normal Heart Rate for Elderly: What You Need to Know - AOL

   www.aol.com/normal-heart-rate-elderly-know...

   Although it’s normal for the heart rate to increase due to physical activity or stress, a resting heart rate that’s consistently higher or lower than usual may be a sign of heart problems or ...