Medical Definition of Z LINE. : any of the dark bands across a striated muscle fiber that mark the junction of actin filaments in adjacent sarcomeres.Britannica.com: Encyclopedia article about Z line.efinition of Z LINE. : any of the dark thin bands across a striated muscle fiber that mark the junction of actin filaments in adjacent sarcomeres. ADVERTISEMENT.
The average fb speed in the MLB is 91-92ish. Catchers compete with this when trying to throw down a runner at 90ish. The average throw speed from third base is 80 MPH. As for the rest of the positions I am not sure of the exact average, but it is not as fast or faster than pitch speed.
Now Commenting On: Yank throws 105.1 mph, is on Cubs' radar. Chapman unleashes 5 fastest pitches in Statcast era. NEW YORK -- Once a pitcher's velocity reaches triple digits, Brian McCann was saying, there no longer seems to be much difference between 104 mph and 105 mph.