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“The CNS recovers in 12-24 hours after a workout”. What does that even mean? What’s recovering? What got tired in the first place? Nobody talking about the trendy subject of “CNS fatigue” ever seems to know, and being skeptical as I am of the outrageous-sounding, my suspicion is that the shroud of mystery is hiding voodoo — or just plain old ignorance. We already know that “fitness people” typically have a grasp of biology somewhat less than what you’d expect from a middle-school science education, which lets them speak of “toxins” hiding away in your body, or with a belief that genes “evolve for” certain types of foods found only in organic supermarkets.
Unfortunately even many who come through exercise science programs come out thinking of the human body as a Mr. Potatohead, just a bunch of pieces that happen to stick together and do stuff. Biology is not a rigid machine obeying a clear set of formal rules. Think storm. Think global economy. Complex, nonlinear, exponential.
Central fatigue is nevertheless a real and observable phenomenon, and I was recently pointed at an article, The Race Against Time, which neatly sums up how it applies to sport.