Activating the LTR reflex seems to be important to the effectiveness
of needle treatment -- which to me begs the question whether it is the reflex arc stimulation that is the proper target rather than the affected fibers themselves..
Just for a data point, needle stimulation does not actually have to produce LTR in order for treatment to be effective, although that has been the standard model until recently. A technique I often use is similar to what is called superficial dry needling, where the needle is inserted very shallowly into the skin above the trigger point, but not into it, and left in for a very short period of time. This PDF mentions the technique on page 6 - http://www.thedryneedlinginstitute.n...y-Needling.pdf