Abstract only here, full article at the link;
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3323922/?tool=pubmed
Abstract
An
influential book written by A. Mosso in the late nineteenth century
proposed that fatigue that “at first sight might appear an imperfection
of our body, is on the contrary one of its most marvelous perfections.
The fatigue increasing more rapidly than the amount of work done saves
us from the injury which lesser sensibility would involve for the
organism” so that “muscular fatigue also is at bottom an exhaustion of
the nervous system.” It has taken more than a century to confirm Mosso’s
idea that both the brain and the muscles alter their function during
exercise and that fatigue is predominantly an emotion, part of a complex
regulation, the goal of which is to protect the body from harm. Mosso’s
ideas were supplanted in the English literature by those of A. V. Hill
who believed that fatigue was the result of biochemical changes in the
exercising limb muscles – “peripheral fatigue” – to which the central
nervous system makes no contribution. The past decade has witnessed the
growing realization that this brainless model cannot explain exercise
performance. This article traces the evolution of our modern
understanding of how the CNS regulates exercise specifically to insure
that each exercise bout terminates whilst homeostasis is retained in all
bodily systems. 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.
Keywords: fatigue, central nervous system, central governor model, anticipation, feedback, feedforward, brain, skeletal muscle
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