The purpose of this study was to demonstrate that the mechanism and the effect of TENS on skin temperature change or sympathetic activity change in thermographic finding and for the evaluation of it's mechanism.

The subjects of this study were 41 patients with HNP, or SCI, or peripheral nerve injury who visited the department of Rehabilitation Medicine, Soon Chun Hyang University College of Medicine from August, 1990 to Jun, 1991

The results were suggested that the possibility of another mechanisms of TENS, except the central serotonergic sympathetic inhibition, such as another intraspinal pathway, or central sympathetic activation, but we could not find which time these mechanisms were inhibited or activated in this study.