Hi Tom,
OK, I finally understand the original statements about "teaching a 
system to burn lactates."  I disagree with the statement that a body 
must be "taught" to burn lactates as a fuel source, which I took 
to imply that without being taught, it DOES NOT burn utilize lactates as 
a fuel source (so you can imagine my confusion).  However, I DO agree 
with the statement that a system can be trained to burn lactates BETTER, 
which is a different thing.  I think somewhere in here I mentioned to 
someone that conditioning does affect different things, among them 
increasing the glycolytic and TCA cycle enzymes, tolerance to lower pH, 
etc.  Of course, there's a huge list of adaptations to conditioning, but 
you can only list so many before dropping off into a light slumber or 
until someone bludgeons you to death with a biochem book :->
As I thought, we're all agreeing on the same thing and just giving it 
different labels.  No offense to anyone, but I did perk up my ears at 
someone saying a horse has to be TRAINED to burn lactates.
Thanks for the post, nice to hear from you.
Susan Evans
Equine Research Center
Cal Poly University