Heart rate

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In physiology, the heart rate is "the number of times the heart ventricles contract per unit of time, usually per minute."[1] This may have to be presented as an average in the presence of arrythmias, such as heart block, when some contractions are missed.

Bradycardia is the condition in which the heart rate is below normal; in tachycardia, it is above normal.


The heritability of the resting heart rate is about 40%, perhaps due to variations in the adrenergic receptor.[2]


In pharmacology, a drug's affect on heart rate may be predictive of the drugs:


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