andaheart, remember that hypertrophy comes from other factors besides the percentage of 1RM you're lifting on any given set. Volume plays two roles:
The first is mechanical -- after a high-volume workout, there's a lot of protein breakdown that's followed by an even greater buildup of muscle protein.
The second is hormonal -- high volume leads to a greater release of growth hormone.
A third factor, which is particular to Alwyn's program design, is the unpredictability of the routines. That is, your muscles don't know what's coming from one workout to the next, so there's a constant adapatation process going on. The theory is that you'll end up with more overall protein synthesis because of the nonstop challenges to your muscles.
You mentioned Chad Waterbury: I'm currently editing a book for Chad, and he says a lot about the importance of volume in the book. Certainly, he doesn't use the same program design as Alwyn, but he does a pretty thorough job of explaining why heavy weights won't produce hypertrophy is the total volume of the workouts isn't high enough.
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