Sorry this'll be a bit late now but i think what you really need to do to answer your own question is define neural tension and why your guy's got/ had it. Base tests check how the CNS can handle input. A hyperalgaesic response involves not just peripheral factors but central processing as well.( CNS up/downregulation). Therefore does the response indicate a recent peripheral incident like a disc herniation ( as the SLR has been shown to have good validity in it's ability to diagnose disc herniation) or do other factors make you think the response may be a result of maladaptive CNS processing, and that any input would be percieved as painful.
I hope this may direct you to more current thinking on AND or whatever the term is now!( Sensitive nervous System, Butler, 2000)