forget about hgh ,
it is not what has caused the times to plummet in sprints .
alot of peolpe say hgh is not even worth effort for alot of athletes ,
only if older athlete like in baseball where can go into 40 ,s
or if have injured joints .
hgh can even make performances worse as many can get bad insulin resistance from it.
much better peds that guaranteed to work and alot alot better .
hgh has been around and heavly used since what 1990
then why this sudden paradigm shift in sprints from 2004,2005
on with liu xiang , powell and then said w.record holder ,horrible creature .
paradigms in sprinting
1960- steroids
then 1980,s-
steroids and heavy weigthlifting / ( and or also some plymetrics like borzov used )
was the next step .
then 2004/2005
all previous peds
and SARMS .