vg440 wrote:
I agree with you Andrew.
I didn't state that repair of myelin was taking place. As the symptom improvements felt are lost at returning to sea level
The multiple factors of improvement felt by ms sufferers at altitude isn't just random coincidence, nor is it just minor improvement in most cases.
There are definitely many factors involved in these effects at altitude.
The myelin migration you mentioned does make sense.
Even though it wouldn't be repairing any damage already existing, it's plausible that the myelin itself could also expand ever so slightly, but enough to notice improvement of symptoms.
Obviously this is an area required to be researched properly and these positive effects on ms sufferers cannot be denied.
If there were only one or two reported cases of altitude improvement it may have been not enough reason to seriously consider.
However, having barely being able to walk 100m to hiking kilometres within a few days at altitude, not to mention no more blurred vision, no more bladder issues, normal balance (except for the vertigo).
I honestly thought I was cured.
That's how great it was!
Until I returned to Melbourne and within a few weeks.. all my symptoms returned.
I think Andrew is closest to explaining this phenomenon based on nerve function. Simply put, nerve conductivity may be improved at high altitudes. Indeed, experiments on rats subjected to prolonged hypoxia demonstrates this concept. See
http://ajrccm.atsjournals.org/cgi/content/full/164/8/1476and in particular:
Quote:
An increased conduction velocity in myelinated and, to a lesser extent, unmyelinated nerve fibers could be explained by the fact that hypoxemia activates ATP-sensitive K+ channels, facilitating the membrane depolarization.
I think your observation that your symptoms returned shortly after returning to a lower altitude shows that high altitude exposure has no long term benefit but a definite short term perk.
I guess "picking your hill to fight on" has added meaning for those suffering from demyelinization. High enough up and WE have the advantage.
You may be interested in a new drug called Fampridine that’s just been approved by the FDA (to be sold in the US under the trade name AMPYRA by Acorda Pharmaceuticals) .
It apparently works much the same way as high altitude by blocking potassium channels on nerve fibres. I believe Biogen have marketing rights to it outside the US and may have applied for approval in Oz. Perhaps all the benefits of high altitude without having to leave home?