The central nervous system controls our body's functions. These include contraction of all muscle groups. Their is a thing called CNS fatigue. There are two points where the CNS gets fatigued: 1) in the muscle itself; and 2) at the point of origin of the muscular contraction( the central nervous system ). Fatigue in the muscle is peripheral fatigue while at the point of origin (brain) is known as central fatigue.
Proper nutrition, supplementation, and sufficient time of recovery between training all help peripheral fatigue. The central fatigue has been focused on with research in the areas of supplementation. Two main supplements are: Serotonin(5-ht) and Dopamine due to their roles in regulating things such as sensory perception, mood, and more. An imbalance in these two could be the reason why we get central nervous system fatigue. When there is an unbalance between the two, high 5-ht/low dopamine, the CNS will become fatigued.
Not only does your muscular system need recovery time, so does your CNS. Over-training can have a big effect on your mental state of mind.
Recent research shows that carbohydrates and branch chained amino acids impact 5-ht/dopamine balance in our brains. Again, this looks like it all comes down too proper meals and proper rest for your muscles and mind.
The bottom here is that your whole being/body needs good eating habits and plenty of mind/muscle recovery to fully get the most out of your workouts.
Training not only effects the body, it effects the brain too.
EAT RIGHT, TRAIN RIGHT, GET THE RIGHT RESULTS.
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