Supertraining

Perhaps this excerpt may help in the understanding of
CNS fatigue:
**************************************
Sports Conditioning and Fatigue
Lance C. Dalleck, M.S. and Kravitz, Ph.D.

http://www.unm.edu/~lkravitz/Article%20folder/sportsconditioning.html

A neural fatigue also exists during short-term,
intensive exercise and sports bouts. Each single motor
nerve (meaning under your voluntary control) activates
a group of muscle fibers (often in the hundreds), and
is collectively referred to as a motor unit.

 The chemical messengers, or neurotransmitters, that
carry the nerve’s excitation message to the muscle at
the neuromuscular junction, also become impaired with
intense exercise. 

This inhibition results in a decreased efficiency of
the muscle fibers ability to contract (Gardiner,
2001). In addition, the protons produced from the
increased glycolysis often interfere with calcium ions
reacting with proteins at the myofilament site in
muscle where contraction is occurring, further
inhibiting the muscle’s ability to contract.

*****************************

Ralph Giarnella MD 
Southington Ct USA 


--- Henk <[EMAIL PROTECTED]> wrote:

> Central nervous system fatigue: an enigma or lack of
> proper definition?
> 
> CNS fatigue: how many time have I read that term in
> the messages this
> group.
> 
> But did anybody ever wonder what the central nervous
> system is?
> 
> Just a quick look at Wikipedia: The central nervous
> system (CNS) represents
> the largest part of the nervous
> <http://en.wikipedia.org/wiki/Nervous_system> 
> system, including the brain
> <http://en.wikipedia.org/wiki/Brain>  and the spinal
> cord
> <http://en.wikipedia.org/wiki/Spinal_cord> .
> 
> Spinal cord
> <http://en.wikipedia.org/wiki/Spinal_cord>
> 
> Brain <http://en.wikipedia.org/wiki/Brain>
> 
> Brain stem <http://en.wikipedia.org/wiki/Brain_stem>
> 
> Rhombencephalon
> <http://en.wikipedia.org/wiki/Rhombencephalon>
> 
> Pons <http://en.wikipedia.org/wiki/Pons> ,
> Cerebellum
> <http://en.wikipedia.org/wiki/Cerebellum> , Medulla
> oblongata
> <http://en.wikipedia.org/wiki/Medulla_oblongata>
> 
> Mesencephalon
> <http://en.wikipedia.org/wiki/Mesencephalon>
> 
>  <http://en.wikipedia.org/wiki/Tectum> Tectum,
> <http://en.wikipedia.org/wiki/Cerebral_peduncle>
> Cerebral peduncle,
> <http://en.wikipedia.org/wiki/Pretectum> Pretectum,
> <http://en.wikipedia.org/wiki/Mesencephalic_duct>
> Mesencephalic duct
> 
>  Prosencephalon
> <http://en.wikipedia.org/wiki/Prosencephalon>
> 
> Diencephalon
> <http://en.wikipedia.org/wiki/Diencephalon>
> 
> Epithalamus
> <http://en.wikipedia.org/wiki/Epithalamus> ,
> Thalamus
> <http://en.wikipedia.org/wiki/Thalamus> ,
> Hypothalamus
> <http://en.wikipedia.org/wiki/Hypothalamus> ,
> Subthalamus
> <http://en.wikipedia.org/wiki/Subthalamus> ,
> Pituitary
> <http://en.wikipedia.org/wiki/Pituitary_gland> 
> gland, Pineal gland
> <http://en.wikipedia.org/wiki/Pineal_gland> , Third
> <http://en.wikipedia.org/wiki/Third_ventricle> 
> ventricle
> 
> Telencephalon
> <http://en.wikipedia.org/wiki/Telencephalon>
> 
> Rhinencephalon
> <http://en.wikipedia.org/wiki/Rhinencephalon> ,
> Amygdala
> <http://en.wikipedia.org/wiki/Amygdala> ,
> Hippocampus
> <http://en.wikipedia.org/wiki/Hippocampus> ,
> Neocortex
> <http://en.wikipedia.org/wiki/Neocortex> , Lateral
> ventricles
> <http://en.wikipedia.org/wiki/Lateral_ventricles>
> 
> Looking at this definition “fatigue of the spinal
> cord” or
> “fatigue/exhaustion of the hypöthalamus-pituitary
> gland” or fatigue of the
> “autonomic nervous system’ could also be called
> central nervous fatigue, or
> do we just mean “fatigue of the brain”, “fatigue of
> the neocortex” or
> “fatigue of the motor cortex”? Is the old term
> “neurasthenia” of
> “psychasthenia”  the same as central nervous
> fatigue.
> 
> Before we throw this term around let’s first define
> what we really mean, no
> miracle nobody comes up with a solution for a
> problem that is so ill defined
> as this one.
> 
> Henk Kraaijenhof
> Amstelveen
> Holland