There was a study done by Kraemer (sp?) that compared low reps (5-8) medium reps (10-15) and high reps (25+) but i can't see if he has put up the lbm gained after the study. To my knowledge doing high reps would make it kinder on smaller ligaments/joints (thinking skull crushers) or possibly play with intensity. But if there was a study that showed a huge difference between 5 rep sets and 10 on lbm gained id understand why every bb'ing forum i visit states rep ranged of 8-12 reps.
Is there a study showing a lbm comparison?