The Effect of Frequency Modulation in TENS on Habituation and Pain Threshold

"Transcutaneous application of Conventional TENS current over the course of the superficial radial nerve in the right forearm for a 20 minutes session. The intensity of the current will increase until participants report a strong but comfortable sensation, just Transcutaneous application of Conventional TENS current over the course of the superficial radial nerve in the right forearm for a 20 minutes session. The intensity of the current will increase until participants report a strong but comfortable sensation, just below motor threshold. Currents parameters are:~Frequency modulation: randomized pattern (from 80 to 120 Hz) Pulse width 200 microseconds"

"Transcutaneous application of Conventional TENS current over the course of the superficial radial nerve in the right forearm for a 20 minutes session. The intensity of the current will increase until participants report a strong but comfortable sensation, just below motor threshold. Currents parameters are:~Frequency modulation: Scan of frequency from 80 to 120 Hz in 6/6 mode (frequency sweep from 80 Hz to 120 Hz in 6 seconds and from 120 to 80 Hz in 6 secons) Pulse width 200 microseconds"

"Transcutaneous application of Conventional TENS current over the course of the superficial radial nerve in the right forearm for a 20 minutes session. The intensity of the current will increase until participants report a strong but comfortable sensation, just below motor threshold. Currents parameters are:~Fixed frequency at 100 Hz Pulse width 200 microseconds"

Electrodes are placed over the course of the superficial radial nerve in the right forearm for a 20 minutes in the same manner as experimental groups, but will be applied a sham electrical stimulation increasing the current intensity of an unconnected channel.