Very interesting. I will research this further. Good job finding this! I have no loss of feeling although slight tingling prior to the heat being turned up on them. Much worse in the evening. Usually a 3-4 hour period when most nights I am in either a bucket of cold water or ice wraps. Cold give immediate relief. Very puzzling ailment. My neuro workup reveled no neuropathy. Doppler US of veins normal, bone scan normal, slight elevation of my C-RP level on blood. Wish I at least had a direction of a system causing this. Very difficult to treat the matter being unable to figure the cause. Many thanks John.