I was wondering what people think of the 15-20 rep range. I have always done low reps and never had any noticeable hypertrophy gains from it. One month I did friendly challenge with my brother which involved seeing how many sets of 15+ reps we could do with 40KG, after a month of this I gained inches on my legs, which are already bigger than the rest of my body proportionately.
I was wondering if 15-20 range has the same effect for the upper body, specifically the big muscles in the back and why 6-12 is chosen above the higher ranges.
Any links to a study or anything with some scientific argument for a certain range for hypertrophy would be appreciated.