Exhausting CNS

[AlexTemper]

The more I consider this, the more I confirm my believe that this is complete tosh.

Muscle failure is simply an act of self preservation caused by lactic acid build up in the muscle and altering Blood PH within the muscle. A larger muscle will contain a higher volume of water so a larger amount of lactic acid is required to cause a big enough PH change to cause failure and a greater amount of lactic acid can only be produced by increased stimulus.

CNS on the other hand is simply a series of electrical impulses and in my opinion no mater how many times you push to failure you simply cannot fatigue electrical impulses.

You can exhaust muscles for sure but not CNS.

This is also a really interesting article on muscle failure due to it's simplicity.

http://www.naturalstrength.com/resea...?ArticleID=206

[mxd]

No way, cns can be depressed as well as stimulated via chemicals, with this reasoning alone, It can also be fatigued via stimulus.

[kp1512]

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The more I consider this, the more I confirm my believe that this is complete tosh.

Muscle failure is simply an act of self preservation caused by lactic acid build up in the muscle and altering Blood PH within the muscle. A larger muscle will contain a higher volume of water so a larger amount of lactic acid is required to cause a big enough PH change to cause failure and a greater amount of lactic acid can only be produced by increased stimulus.

CNS on the other hand is simply a series of electrical impulses and in my opinion no mater how many times you push to failure you simply cannot fatigue electrical impulses.

You can exhaust muscles for sure but not CNS.

This is also a really interesting article on muscle failure due to it's simplicity.

http://www.naturalstrength.com/resea...?ArticleID=206

Food for thought..and brings in another point I made about evolution in strenght training.

I think those that train for strenght alone can do it much more quicker and faster if they actually stepped back and looked at training and patterns.......I firmly beleive alot of this ME\DE stuff that goes on is simply something that delays progression in strength atheletes....but thats a diff topic

KP

[Ripped Barbarian]

You are gravely wrong, in my opinion.

The CNS isn't simply 'electrical wires' or anything, it has chemical synapses using neurotransmitter chemicals, these require time and minerals/nutrients to replenish.
There is a strong relationship between these neurotransmitter chemicals and glands in the brain and other places in the body (adrenal etc)

If you push your body harder and harder synapses can become dulled by too many chemicals (it's a self preservation thing) and can be drained/burnt out, especially if nutrition isn't on key, it's all dependant on calcium ions and the like, i can't claim to know much about the inner workings but i do know you can hammer your CNS.....

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Desensitization of the post-synaptic receptors is a decrease in response to the same neurotransmitter stimulus. It means that the strength of a synapse may in effect diminish as a train of action potentials arrive in rapid succession--a phenomenon that gives rise to the so-called frequency dependence of synapses. The nervous system exploits this property for computational purposes, and can tune its synapses through such means as phosphorylation of the proteins involved.

[sendos]

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CNS on the other hand is simply a series of electrical impulses and in my opinion no mater how many times you push to failure you simply cannot fatigue electrical impulses.

Where did you get that idea? neurones are very complicated cells... its not just a matter of turn a switch one end electricty comes out the other :S. The process of creating potential difference through the nerve is a complicated process. Quite a big drain on things like sodium potassium and calcium ions. And even then the potential differnce doesnt do anything without the neurotransmitters in the synapse. Over stimulation of CNS is a drain on numerous nutrients and with out proper time for recovery exaustion as a result is quite plausable.

[James Copping]

CNS fatigue happens, from a personal perspective I have felt it. After heavy pre contest squatting I can be knackered for up to 3 days afterwards.

[AlexTemper]

But thats all muscle fatique and the affliction is of a physical and structual nature. You have muscular damage but I'd bet your CNS will be just fine.

Regarding the structure of neurons etc I know how these function and the make up etc... but the workings aren't mechanical here, they're chemical and I just don't see this chemical process suffering from any kind of fatigue.

[James Copping]

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But thats all muscle fatique and the affliction is of a physical and structual nature. You have muscular damage but I'd bet your CNS will be just fine.

Not at all, its almost 100% mental fatigue. My muscles are fine, I rarely get bad pre contest DOMS or anything, its just a general feeling of fatigue and tiredness. You are putting your body under a lot of stress, stress causes fatigue.

Thats a good point actually, a lot of people get fatigued just through sheer stress and they dont even lift a weight. Lifting causes a lof of stress to the body hence can cause fatigue.

[Sty Stallone]

I think it is possible to fatigue the CNS .
Thats why i see rest in a weights program as central.

I do think a lot of people put a lot of overemphasis on not fatiguing the CNS and see this as a reason to avoid training to failure .


It does happen but its no the big evil some would make out

[Ripped Barbarian]

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Regarding the structure of neurons etc I know how these function and the make up etc... but the workings aren't mechanical here, they're chemical and I just don't see this chemical process suffering from any kind of fatigue.

How so?

The body can only produce so many chemicals and then there is developing resistance etc (just like insulin resistance in cells protecting themselves from too much sugar, becomes diabetes often the beta cells 'give up')
Adrenal fatigue is well known, this is mostly a chemical problem.

Trust me, you can fatigue your CNS, it might be harder in some individuals to reach this point before muscle fatigue but i know it will occur if you completely blast yourself out no matter who you are, some people will easily fatigue their CNS (probably due to another stree disorder or problem etc)