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It depends on the individual, but if you have a strong heart (usually athletes) a resting heart rate can be below 50 without any negative effects. But, in most individuals a heart rate of 45 can be something that might need to be treated with medications or a pacemaker.

Pulse rate < 60 beats per minute is known as bradycardia.

Sources:

http://en.wikipedia.org/wiki/Bradycardia

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13y ago

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