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[[File:2110 Pulse Sites.jpg|500px|thumb|right]]
The '''heart rate''' (or '''HR''') is classically defined as the number of heartbeats per minute simply because counting heartbeats for an hour is just too long.<ref>[http://gomerblog.com/2017/03/heart-rate/ Med Student Figures Out Heart Rate: Count Beats in a Day, Divide by 24 Then Again by 60(Gomerblog)]</ref>