Originally Posted by
MuscleScience
Basically the theory is that when you exercise vigorously that not only are the muscles being broken down and need some time of relative inactivity to repair so to does the nervous system. The fact that neurotransmitters are being produced and recycled continuously and that this process is not 100% efficient leads to the belief that over time just like how the muscles can be overtrained without enough rest so to can the nervous system.
There is actually a lot of research going on in this area right now. I for one was not a big believer in it until about a year ago. I thought that it was the stupidiest thing I ever heard until I looked at the research and really sat down and though out neuro anatomy better.
I should say that I am not 100% sold on the theory yet, more research in the area needs to be done. But so far the overall body of evidence is looking very supportive to some sort of CNS fatigue effect on training and growth.
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