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.
The speed of a baseball is measured using a Radar Gun. Today, in the late 1990s pitchers can throw over 100 miles per hour (160 km/h or 45 m/s). Matt Anderson, has thrown the fastest pitched baseball which measured 103 miles per hour (166 km/h or 46.0 m/s). This time was measured in the past 1999 baseball season.