Quote (Afficionado @ Apr 3 2014 09:32am)
Plz put it on the blog..
I changed my mind on this lol.
After trying to put it together, I couldn't find enough true aspects of it.. ESPECIALLY in regards to resistance training. Quite abstruse
It boils down to;
Sympathetic overtraining - occurs first.. leads to sympathetic nervous predominance. You have an increase in circulating epi/norepi, but a decrease in beta receptors, thus decreased catecholamine sensitivity. You then have subsequently decreased performance
Parasympathetic overtraining - occurs last.. it's PSNS predominance. You have decreased CNS drive, decreased hypothalamic-pituitary action/drive, both decreased epi/norepi and beta receptors, and lower overall energy availability.
It seems before true manifestation, there's a change in acute hormonal responses, before the resting levels begin to shift.
There's overall HPA axis alterations and thus decreased ACTH, GH, LH, and FSH.
There also seems to be differences in neurotransmitters.. this is one of the abstruse aspects I talked of.. it's more well known in endurance OT than resistance. In resistance however, it seems that hippocampal serotonin is inhibited/not sensitized to release from the chronic stress.. this also downregulates the HPA axis.
Further, this next bit is a bit of an extrapolation on my part but meh.. in the mesencephalon (midbrain), is the raphe nucleus, which is the major region of serotonergic neurons, which innervates the hippocampus. The raphe nuclei also heavily innervate the locus coeruleus, which is the main site of norepinephrine secreting neurons. So, if the hippocampal serotonin is decreased, it stands to reason that a lot of the decrease in sympathetic drive stems from the raphe nucleus.. and thus serotonin may play a large role in overtraining.