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

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   However, oftentimes lower heart rates can be totally normal, and a well-trained athlete can have a normal heart rate in the 50s or as low as 40 without any cause for concern, he notes.

3. Bradycardia - Wikipedia

   en.wikipedia.org/wiki/Bradycardia

   The term "relative bradycardia" can refer to a heart rate lower than expected in a particular disease state, often a febrile illness. [8] Chronotropic incompetence (CI) refers to an inadequate rise in heart rate during periods of increased demand, often due to exercise, and is an important sign of SND and an indication for pacemaker implantation.

4. Athletic heart syndrome - Wikipedia

   en.wikipedia.org/wiki/Athletic_heart_syndrome

   Example ultrasound of an athlete. Athlete's heart most often does not have any physical symptoms, although an indicator would be a consistently low resting heart rate.. Athletes with AHS often do not realize they have the condition unless they undergo specific medical tests, because athlete's heart is a normal, physiological adaptation of the body to the stresses of physical conditioning and ...

5. Chronotropic incompetence - Wikipedia

   en.wikipedia.org/wiki/Chronotropic_incompetence

   When the heart rate does not rise sufficiently, this can lead to exercise intolerance. CI can be detected using a cardiopulmonary exercise test. [1] People with CI have a higher risk of cardiovascular disease and early death. [1] There are different ways to define CI. One common threshold is not being able to reach 80% of age-predicted maximal ...

6. What do I do if my resting heart rate is too high or low? - AOL

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   “The more exercise and regular cardiovascular exertion that you have, the lower your resting heart rate will be,” Ebinger tells Fortune. “That’s a reflection of a healthy cardiovascular ...

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

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   A low resting heart rate in the 50s is generally associated with better cardiovascular health, continues Dr. Steinbaum. ... “Heart rate variability with exercise, and during recovery after ...

8. Sinus bradycardia - Wikipedia

   en.wikipedia.org/wiki/Sinus_bradycardia

   [medical citation needed] Sinus bradycardia can also be an adaptive advantage; for example, diving seals may have a heart rate as low as 12 beats per minute, helping them to conserve oxygen during long dives. [4] Sinus bradycardia is a common condition found in both healthy individuals and those who are considered well-conditioned athletes. [5]

9. Pacemaker syndrome - Wikipedia

   en.wikipedia.org/wiki/Pacemaker_syndrome

   Individuals with a low heart rate prior to pacemaker implantation are more at risk of developing pacemaker syndrome. Normally the first chamber of the heart (atrium) contracts as the second chamber (ventricle) is relaxed, allowing the ventricle to fill before it contracts and pumps blood out of the heart.