During sleep a slow heartbeat with rates around 40–50 bpm is common and is considered normal.
When the heart is not beating in a regular pattern, this is referred to as an arrhythmia.
Bradycardia is a slow heart rate, defined as below 60 bpm at rest.
Several studies, as well as expert consensus indicates that the normal resting adult heart rate is probably closer to a range between 50–90 bpm.
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Heart rate is the speed of the heartbeat measured by the number of contractions of the heart per minute (bpm).
There are many ways in which the heart rate speeds up or slows down.