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 average major league fastball is 88-89 mph on a JUGS Speed Gun and 84-85 mph on the Ra-Gun. Scouts will rarely if ever sign a pitcher who does not throw at least 85 mph on the JUGS Speed Gun. CHECKLIST FOR GRADING PITCHERS Fastball-The first thing a scout looks for is a fastball with good velocity and movement.he Jugs Speed Gun (Fast Gun) will pick up the speed of the fastball after it has traveled 3.5 feet and the Ra-Gun (Slow Gun) will pick up the speed after the ball has traveled 40-50 feet. A fastball will lose 8 mph from the time it leaves the pitchers hand to the time it crosses home plate.