LA does not increase AA in humans?

Any thoughts?
http://www.ncbi.nlm.nih.gov/pubmed/21663641

 

The study is hard to evaluate. At the first glance it seems they measured immediate response.

We know from LA Veterans Study that all cause mortality started to rise after 5 years of high PUFA diet

And when directly measured in aorta, plaques contain significantly greater amount of linoleate than in normal aorta
http://www.ncbi.nlm.nih.gov/pubmed/8466938
http://www.ncbi.nlm.nih.gov/pubmed/7934543

And I think it's weird that the title of the study you link mentions "tissue arachidonic acid content", while in conclusion it reads
Our results do not support the concept that modifying current intakes of dietary linoleic acid has an effect on changing levels of arachidonic acid in plasma/serum or erythrocytes in adults consuming Western-type diets.
From what I read I think AA is mostly stored in cells