I am a retired nurse with peripheral neuropathy from spinal stenosis and notice a difference in numbness after stretch and hold exercises, however it doesn't last The concept is to promote neurogenesis with increasing blood circulation to the capillary beds. This concept is similar to angiogenesis of the heart through exercise to promote collateral circulation in the heart. Loma Linda University has a Physical Therapy program that eliminates or reduces the problem. The have finished a 10,000 cohort study of their program with impressive results They also use ultrasound. I wrote to them and received a brochure but no exercise instructions. Shame they are not willing to share their program with the millions of American's suffering from peripheral neuropathy outside of LA. Perhaps passing this on to your physical therapist may help define the program. I do not know if works for both large and small fibers. Good luck!