Originally Posted by Matt Reynolds

The Supercompensation Theory- has been, in the bodybuilding community, the most widely accepted school of thought. However, people are beginning to see it as a bit too simplistic (the strength and conditioning and athletic movements have never accepted this practice). The theory itself is based on the fact that training depletes certain substances (like glycogen, and slowing protein synthesis). Training is seen as catabolic, draining the body of its necessary nutrients and fun stuff. So to grow, according to the theory, the body must then be rested for the appropriate/ optimal amount of time, AND, it (the body) must be supplied with all the nutrients it lost. If both of these things are done correctly, then theoretically your body will increase protein synthesis and store more nutrients than it originally had! (i.e. – your muscles will be bigger!)
So obviously the most important part of this theory is TIMING! (Specifically concerning the rest period). But that's where the problem comes in. "If the rest period was too short, then the individual would not be completely recovered and as such the training would deplete the substance even more, which over a period of time would result in overtraining and a loss of performance. If the rest interval were too long then the training would lose its stimulus property, and the individual would recover completely and lose the window of opportunity to provide the stimulus again. If the interval is optimal then improvements surely follow" (AF).
"So, given the one factor theory (Supercompensation), which looks at physical ability as, of course, one factor, you are left with the problem of timing workouts to correspond to the supercompensation wave... anything sooner or later will lead to a useless workout"(JS).