Is there a question in there somewhere?
Of course, ST fibers contribute to sprinting (and jumping and throwing) considering that even the most elite explosive athletes have, at the most, 70% FT fibers (most sprinters are in the 60-65% range). If only the FT fibers contributed they would only use about half of their muscle’s potential, which would make no sense.
A 10.9 to 10.7 improvement is “okay” but one has to remember that many different elements come into play with top speed. Heck, a top sprinter will have as much as a 0.5 - 0.7 time difference from day to day, Depending on recovery, sleep, wind, mental state, etc. A 0.2 difference doesn’t necessarily indicate an improvement in speed as that time difference is well within the normal daily variability.
Heck, even within the day, maximal performance can fluctuate up to 10.2% depending on the time of day.
Not to mention that the actual sprinting training, technique improvement, reaction time to the gun, etc. can easily make for a bigger difference than 0.2.
What if the study first tested the sprinters at the beginning of their season and the post-test was conducted near the end of the season? A sprinter EASILY gains 0.2 seconds during his prep period (sometimes a lot more). Without being able to read the study (which is, conveniently an old Russian study than nobody can find and verify) we don’t know the conditions and time frame of the study. But since it was a hypertrophy study, it must have been at last 8-10 weeks long (less than that is too short to make a difference). During a normal track season, it is normal for a sprinter to get 0.2 faster in 8-10 weeks. In fact, that is a pretty small improvement.
Pavel has a lot of good stuff, don’t get me wrong. But he has a history of citing Russian studies that none of us can verify and also in spinning/self-interpreting the studies results to prove his point.
Look at how 99% of the top sprinters in the world train. None of them do “slow twitch specific hypertrophy work”.
And 10.7 is fast, for sure. But to put things in context in 2022 at the Texas state (so only athletes from the state of Texas) HIGH SCHOOL championships (so under 17-18 years of age) there were 7 boys (again, 17-18 or under) that ran faster than 10.7. (winner was 10.22). At the Florida HIGH SCHOOL level, they were even faster with 5 boys (18 or under) running faster than 10.27 (including one in 9.83 and one in 10.02).
At the national HIGH SCHOOL championships (USA) 10.7 didn’t even get you in the finals (13th best time was 10.69).
So it’s not like the research cited by Pavel led to results that were so good that they would make people want to change the way they train.
Again, rather than look for a theoretical “secret” way to train. Look at how the bulk of the most successful people do it.
BTW, if you understand how muscle fiber recruitment work, you’d know that there is no real need for a “slow twitch specific” protocol, as the ST fibers are the first ones to be brought in any type of muscle contraction except electrical muscle stimulation and are ths trained regardless of the protocol.