My assumption was that a) PT can increase cycling fitness "most effectively", (regardless of specificity is implied,) and my question was b) is it also true for those who do low hour training like 6-8 hours. I was looking for more than just "search for answers, seek and thee shall find."
I was looking more for sources like the study I link to below, or better yet, "respected experts" who can give an opinion by referencing a few studies.
These subjects did 7-10 hrs a week.
http://www.tradewindsports.net/wp-co...-polarized.pdf