Originally Posted by Gnomekicker
From what I understand on the subject. You do more sets of less reps at a heavier weight to build muscle mass. The muscle mass you put on from this isn't very dense. Doing less sets at a higher rep count with less weight makes your muscles more dense and stronger instead of really creating any mass. Builders alternate between both.
You got it the wrong way round, its the oposite.
Heavy weight less reps = density and minimal growth.
Low weight and more reps = Growth and less density.