heart rate

noun
the number of heartbeats per minute.
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American Heritage
Medical Dictionary

heart rate n.
Abbr. HR
The number of heartbeats per unit of time, usually expressed as beats per minute.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
heart rate  
The number of heartbeats per unit of time, usually expressed as beats per minute.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Example sentences
Sensors will monitor heart rate, temperature, oxygen-saturation level and
  movement.
The system monitors subtle changes in seven streams of real-time data, such as
  respiration, heart rate and blood pressure.
We have also found that they may affect other physiological measures including
  heart rate.
Studies have shown that acupuncture can increase blood flow, lower heart rate
  and improve immune function.
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