Pulse signal is one of the most primary physiological signals, including the pulse frequency, the pulse rhythm, pulse-filling ratio, state of stream, state of motion, fluctuation amplitude and so on.

The pulse is differentiated in terms of depth (superficial or deep), speed ( rapid or slow), strength (forceful or weak), shape ( thick or thready, soft or hard) and rhythm.

The pulse should be recorded as not just the rate but also the rhythm.