Heart rate

A heart rate was a term used to refer to the number of heartbeats in a humanoid.

In 2371, during The Doctor's delusion on the USS Voyager's holodeck, he scanned himself and discovered he had a heart rate. 

In 2373, after scanning Lieutenant Tuvok in sickbay, The Doctor noted that his heart rate was at three hundred beats per minute after he was found to be suffering from a severe panic attack on the USS Voyager. Tuvok had a memory of when he was a child, a girl fell from a precipice and he was unable to help her up, although he could not remember it happening. Recalling this event triggered his accelerated heart rate. Tuvok's condition was later discovered to be caused by a memory virus unknowingly placed into his brain by his former crewmate on the USS Excelsior, Lieutenant Commander Dmitri Valtane shortly before he apparently died in 2293.