What is "heartrate"

Usage examples of "heartrate".

Tad knew that his partner was about to waken when her breathing speeded up and her heartrate increasedboth of which he could hear quite easily.

The most Remo could do was to lower his heartrate and will his body into a simulation of basal metabolism.

How could they possibly monitor their heartrates and know what they were doing, automatically, from the moment they arrived?

There must be hundreds and hundreds of kids here, and there would be computers reporting the whereabouts, the heartrates, and who could guess what other information about them.