NO
All muscle are made up of about 50/50 fast twitch and slow twitch -
variences occur depending on genetics, type of muscle, and
training. When you say athletes has "endurance muscle" - type I,
slow twitch this couldn't be further from the truth - easy example,
a sprinter.....
Type I, slow twich muscle fibers have the least potential for
growth.
Hope this will help you research further.