While I was initially put off by the idea of a higher rep range, Carpinelli's Size Principle* notwithstanding, I just learned that there was some research conducted a few years ago suggesting that a higher rep range is better for building size than a lower rep range, provided that sets are taken to failure:
http://www.cbass.com/LightWeights.htm
The results of this study fly in the face of conventional wisdom
(broscience) which calls for lower rep ranges for hypertrophy. I think a higher rep range is compelling for a few reasons, aside from its apparent efficacy. First, it increases exercise volume a bit to compensate for an otherwise low-volume workout. (Perhaps this point partly explains its value.) Second, a higher rep range is easier on the joints, all else being equal. And, finally, conventional wisdom (oh-oh) suggests that going to failure on a higher-rep set is less taxing on system resources than doing so on a lower-rep set. If true, then recovery would be better between workouts.
Assuming that the test results are valid, reliable and accurate, it is a welcome bit of news.
And so, whereas I long favored a range of 8 to 12 reps, it might be worth my while to at least consider 12 reps or so as the lower end of my range. (I'm not quite ready to accept a ~24-rep range just yet, as presented in the study.)
http://www.cbass.com/Carpinelli.htm[/QUOTE