A heart rate monitor is a personal monitoring device that allows one to measure one`s heart rate in real time or record the heart rate for later study. It is largely used by performers of various types of physical exercise. ==History== Early models consisted of a monitoring box with a set of electrode leads which attached to the chest. The first ....
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http://en.wikipedia.org/wiki/Heart_rate_monitor
A device that measures the electrical activity of the heart (heart rate); usually consists of a chest strap and watch-like wrist receiver
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http://www.howtobefit.com/glossary-of-running.htm
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