I love resurrecting the dead, especially char dawg. 
Anyway, Bryan Haycock wrote this on his forum today in explanation of what HST is trying to accomplish and I thought that perhaps someone here may appreciate seeing it. If, not, just skip over it.
"I think in order to understand why HST is the way it is, one must read the research. All the research does is explain why certain things have worked in the past and why other things are simply tradition.
The research that led to HST looks at why and how a muscle is able to adapt to mechanical overload. In light of this current research it becomes apparent “why” lifting weights builds muscle, not simply that it does. Not only that, but it also allows one to separate the role of the nervous system from the role of the muscle tissue.
Recovery issues are about the CNS. A muscle will grow with a constant load applied without any kind of break or rest or unloading. All of the strategies that we use to accommodate the limitations of our CNS are just that, ways of accommodating the limitations of the CNS. Don’t confuse them with the actual stimulus and pathways that cause the tissue to hypertrophy.
It is a given that under normal circumstances you can’t completely separate the stimuli for size vs strength. You are mistaken if you think I am saying it is all or nothing. But until people realize that the neurons of the CNS and the sarcomeres of the muscle tissue are not one in the same, confusion will continue about what stimuli is causing what.
If you prefer neither to consider the research, nor to put it to the test, that is your, and everyone else’s, prerogative. I have always said that most weight lifting routines contain one or more methods specific to hypertrophy, and as such they will make you grow to the extend they adhere to the physiological principles of overload induced hypertrophy. If that is enough for you, I support you 100%. All I want is for people to reach their bodybuilding goals.
I have written extensively on how HST is different and why. In the end, HST puts emphasis on mechanical load as the primary stimulus for growth. This is justifiable in that mechanical load IS the primary stimulus for growth in a steroid-free lifter. Progressive and frequent (if not constant) loading are KEY to hypertrophy.
Now, if you are concerned with strength and performance, you must adjust both frequency and monitor fatigue. These necessities have led to a strategy called periodization. Periodization is a method of manipulating training variables to facilitate CNS function and adaptation. After all, strength is neurological issue. Yes, the cross sectional area of the muscle fibers is a limiting factor, but the greater variable in any individual’s strength is the extent to which their CNS has been “trained” for maximal activation and coordination.
Now, I seriously doubt that I have addressed shakeel’s concerns in this post. The only real arguments against HST are related to the research upon which HST is based. If the research is wrong, HST is wrong. Additionally, if I have interpreted the research wrong, HST is wrong. How do you come to a conclusion as to the validity of HST then? You must first judge the research. Investigate it. Try it. Question it. Weigh the evidence for or against the author’s conclusions. Of course you can always question the premise as well. The other way, and I have said this many times, is to apply the principles outlined in HST to your own training. If something happens, ask why. Go back to the research and compare it to your experiences in the gym. If you grew, what does the research tell you about how and why you grew. If you didn’t grow, what does the research looking into muscle hypertrophy tell you about why you didn’t grow.
I can promise you one thing. The answers to both these questions are there if you are willing to explore what we know about muscle tissue. You can read all day about what people “do” in the gym. But it won’t bring you any closer to knowing what you should be doing in the gym to reach your goals. The history of weight lifting is based on the hit-or-miss experiences of those who have gone before. This is fine. I simply say, now use what science has to show us in order to make sense of their experiences. Only by doing this will we be able to reduce the amount of error in current methods of weight lifting used to build size or increase strength."