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2. Tachycardia - Wikipedia

   en.wikipedia.org/wiki/Tachycardia

   Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate. [1] In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. [1] Heart rates above the resting rate may be normal (such as with exercise) or abnormal (such as with electrical problems within the heart).

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

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

   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.

4. Sinus tachycardia - Wikipedia

   en.wikipedia.org/wiki/Sinus_tachycardia

   Sinus tachycardia is a sinus rhythm of the heart, with an increased rate of electrical discharge from the sinoatrial node, resulting in a tachycardia, a heart rate that is higher than the upper limit of normal (90-100 beats per minute for adult humans). [1] The normal resting heart rate is 60–90 bpm in an average adult. [2]

5. Heart rate - Wikipedia

   en.wikipedia.org/wiki/Heart_rate

   Tachycardia is a high heart rate, defined as above 100 bpm at rest. [4] ... [28] [29] without severe problems through exercise stress. [30] ...

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

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

   One of the most effective habits you can make to lower your heart rate is by exercising routinely and regularly, says Suzanne Steinbaum, M.D., cardiologist and spokesperson for the American Heart ...

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

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

   “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 ...

8. Arrhythmia - Wikipedia

   en.wikipedia.org/wiki/Arrhythmia

   Increased heart rate is a normal response to physical exercise or emotional stress. This is mediated by the sympathetic nervous system on the sinus node and called sinus tachycardia. Other conditions that increase sympathetic nervous system activity in the heart include ingested or injected substances, such as caffeine or amphetamines , and an ...

9. Does your heart beat faster when you stand or sit up? Learn ...

   www.aol.com/does-heart-beat-faster-stand...

   POTS patients experience an increase in heart rate within a few minutes of standing or sitting up. This makes it different from other conditions that generally cause a fast heart rate.