@
sming
Exactly right on the OI=orthostatic intolerance
AT = anaerobic threshold. It is determined using a CPET test (an exercise test on a bike). Most, probably all, ME/CFS patients have abnormal CPET tests indicating problems with aerobic metabolism so that we are doing
anaerobic exercise during activities of daily living. That is, our bodies use anaerobic glycolysis for most daily activities (metabolic equivalent to hardcore training for most people) instead of the normal aerobic metabolism. This causes many difficulties with physical activities so many of us are unable to work and largely housebound. Some of us are bedbound.
If you have ME/CFS and are still working, I
strongly suggest you get yourself into the care of a top ME/CFS specialist so that you stay that way. Many of us started with mild symptoms like yours and deteriorated over the years because we weren't getting the right medical advice and treatment. Proper pacing is critical slowing the downward slide. Patients who get the right care within the first 3-5 years of the illness have a much greater chance of remission than patients who don't. No sense in missing that golden window.
There are only a handful or two of top ME/CFS specialists -- very, very few in most parts of the world -- so most of them have long waiting lists. I suggest you get on several waiting lists now.