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 fastball is between 50-60 mph for a pitcher in the Majors division of Little League. Pitchers in the Little League World Series throw fastballs 60-70+ mph.A few adult-size 13-year-olds can top out at 75+ mph! 2015 Little League World Series.his is similar to the reaction time needed to hit a 92 mph fastball in the MLB. RHP Jarrett Tadlock from Pearland Texas threw 11 pitches â reaching 72-73 mph â to one batter from Boulder, Colorado. Bach ended the sequence with a bloop single to right field.