Circumferential pedal velocity is a measure of how fast the pedal moves around the circle it makes while pedaling. It is derived from cadence as follows:

CPV = C*CL*2*Pi/60

Where CPV = circumferential pedal velocity (in m/s), C = cadence (in rev/min), CL = crank length (in m), and the constants 2, Pi, and 60 serve to convert the data to the proper units.

While technically muscle shortening velocity or at least joint angular velocity should be used instead of CPV, CPV has been shown to be an excellent predictor of joint angular velocity and, by extension, muscle shortening velocity.