Peter Sagan had heart surgery on Friday after doctors determined that he had a heart abnormality that caused his heart rate to spike above 200 beats per minute during a mountain bike race in Valencia.

Taking easy runs too fast is a common habit among runners, much to the chagrin of coaches everywhere. I know staying in the ...

A dangerous heart rate is when your heart is beating too slowly (bradycardia) or too quickly (tachycardia). An adult’s heartbeat is too slow once it's less than 60 bpm, and too fast once it's more ...

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Bradycardia is an arrhythmia, or heart rhythm disorder. It is usually diagnosed when your resting heart rate—the number of times your heart beats in one minute when you're at rest—is slower than 60 ...

Thump, thump. The pounding rhythm is synonymous with the beat of life itself - the sound of a person's heartbeat. This remarkable organ is a marvel of nature, working nonstop day after day, month ...

Average heart rates vary widely. During stress, the body releases hormones that trigger a “fight or flight” response. A person’s heart rate may increase and exceed 100 beats per minute (bpm).

Sleep bradycardia is a slow heart rate during sleep. It may be a natural, healthy sleep response or a sign of an underlying health issue. Most healthy adults have a heart rate between 60 and 100 beats ...