The brain uses the symptoms of fatigue as key regulators to insure that the exercise is completed before harm develops. These sensations of fatigue are unique to each individual and are illusionary since their generation is largely independent of the real biological state of the athlete at the time they develop. The model predicts that attempts to understand fatigue and to explain superior human athletic performance purely on the basis of the body's known physiological and metabolic responses to exercise must fail since subconscious and conscious mental decisions made by winners and losers, in both training and competition, are the ultimate determinants of both fatigue and athletic performance.
Full text here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3323922/
More on this in this blogpost here: http://brainposts.blogspot.ca/2012/11/exercise-and-brain-fatigue.html
Fatigue is a Brain-Derived Emotion that Regula… [Front Physiol. 2012] – PubMed – NCBI
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