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Originally Posted by jornT If there's one aspect about training I don't get much of it'd overtraining, so I might be all wrong, but I though overtraining was overtraining of the CNS and thus you can't overtrain a muscle group while the rest of your body is okay? |
There is both physical and neural overtraining (the first being very uncommon, and the second quite frequent).
Physical overtraining is when you damage your muscles at a faster rate than they can repair. This means the microtrauma eventualy becomes chronic and the muscle becomes inflamed (and needless to say you can't realy work a muscle in this situation). This is uncommon because in order to achieve this you'd have to work the muscle with like 100% intensity, five times a week, and by the time you got to this point your CNS would have shut down a long time ago and you wouldn't be lifting anything at all, so you see how hard it is to overtrain the actual muscle.
Neural overtraining is when the central nervous system becomes too fatigued, and eventualy starts slowly shutting down to prevent further aggravation. Until you actualy take time off to let it rest it'll just lock up further. If you still don't stop you'll get mood swings, extreme weakness, loss of apetite, etc etc. Overtraining the central nervous system isn't that hard - going to failure and/or lifting at very high intensities (>80%1RM) realy takes down the CNS, so if you do this several times a week you'll start overtraining (this is why going to failure is pretty much counter-productive, specialy if you work each body part more than once a week). Keep in mind though that different parts of the spinal cord control different parts of the body - for example, going to failure on the bench and going to failure on the leg press will burn different parts of the CNS.
As far as the forearms, they're very hard to overtrain because:
1) They're trained with lots of volume, but not realy that much intensity;
2) They are at the far ending of the nervous system and the muscles in question are so small that they don't realy burn it up enough to cause overtraining.