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.
[6]. 1  Using the high speed impact test, wood bats produce batted-ball speeds between 88-90mph (there are no data points for wood bats because a solid wood bat does not have a hoop frequency). 2  Single-walled aluminum slow-pitch softball bats produce batted-ball speeds between 90-96mph.