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.
For perspective, a baseball pitcher would have to throw a ball at 107.5 miles per hour to match Abbot's record-breaking pitch, reports MonicaAbbott.com. However, the fastest baseball pitch on record is 100.9 miles per hour, thrown by the California Angels' Nolan Ryan during a game against the Detroit Tigers held in 1974.