The Combined Effect of TENS and TaVNS on Pressure and Heat Pain Thresholds in Pain-Free Subjects

"Both concha will be swabbed with an alcohol wipe before applying a thin layer of conductive gel. An ear clip electrode will be placed in the concha of both ears.~A frequency of 25 Hz will be applied with a pulse duration of 200 µs. Every 5 minutes, the subject will be asked if the intensity can be increased, decreased or remain the same to maintain the same level of intensity. Participants will also receive active TENS, 100 Hz, 200 µsec on forearm."

For placebo TaVNS, the intensity will be increased to a sensory level and then decreased to 0 mA. Participants will also receive active TENS, 100 Hz, 200 µsec on forearm.

TENS will be applied on subject's forearm at a strong but comfortable intensity