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 example, Madison Bumgarner âs loss of velocity is one of the big stories out of spring training. His 93-mph fastball velocity went missing some time last summer, replaced by a 88-90 mph version. Everyone seems to agree thatâs not good.Some people hope his velocity will eventually return; others seem to be readying their typewriters to punch out his baseball obituary. donât fully understand whatâs going on with the pitchers in their 30s. In the oldest group, I suppose that at least some of what we see is selective sampling at play. If an old pitcher loses speed on his fastball and loses effectiveness, he probably retires in pretty quick order.