Changes in sympathetic activity during high frequency T.E.N.S

Recent studies have clarified some of the relationship between the autonomic nervous system and causalgic pain, but much is not known about the nature of pain. It is known that TENS may help to alleviate the chronic pain resulting from peripheral nerve lesions, and various beneficial results are usually ascribed to subjects who have pain. Our own study measured various parameters before and after TENS in healthy subjects, and these findings contrasted markedly with the results attributed to TENS in subjects suffering from pain. This raises interesting questions about the nature of TENS as a pain control.