Clinical Research Directory

Participants will receive one 20-minute session of Transcutaneous Electrical Nerve Stimulation (TENS) applied over the radial nerve of the non-dominant forearm. Two surface electrodes will be placed under ultrasound guidance (General Electric (GE) Logiq P9), longitudinally along the nerve path, approximately 5-8 centimeters (cm) proximal and distal to the lateral epicondyle. Stimulation parameters will consist of a biphasic symmetrical current at 2 Hertz (Hz) frequency, 250 microseconds (µs) pulse width, and an intensity adjusted to the maximum tolerable level without pain. The stimulator used will be an ENRAF NONIUS Endomed 484 (Madrid, Spain). Participants will remain in a supine position with the forearm supported in a prone posture. In addition, participants will receive a placebo needle intervention, consisting of a non-penetrating sham needle applied to the same anatomical region without skin insertion. This procedure mimics the sensation of needling but does not break the skin o

Participants will receive one 20-minute session of Percutaneous Electrical Nerve Stimulation (PENS) targeting the radial nerve of the non-dominant forearm. A sterile 0.30 × 50 millimeter (mm) acupuncture needle will be inserted under ultrasound guidance (General Electric (GE) Logiq P9, General Electric Healthcare, Milwaukee, WI, USA) approximately 1-2 mm from the radial nerve, at a depth of 2-3 centimeters (cm), avoiding direct contact. A surface electrode will be placed 2.5 cm distal and 1 cm cranial to the needle. Stimulation parameters: biphasic current, 2 Hertz (Hz) frequency, 250 microseconds (µs) pulse width, and intensity adjusted to the maximum tolerable level without pain. The stimulator used will be an ENRAF NONIUS Endomed 484 (Madrid, Spain). Participants will remain in a supine position with the forearm supported in a prone posture.

Participants will undergo a sham Transcutaneous Electrical Nerve Stimulation (TENS) procedure identical in setup and duration to the active TENS group. Two surface electrodes will be placed under ultrasound guidance (General Electric (GE) Logiq P9) along the nerve path, 5-8 cm proximal and distal, and the current will be increased for \~30 seconds until a strong but comfortable tingling is felt, then reduced to 0 milliamperes (mA). The electrodes will remain in place for 20 minutes to mimic the active procedure. The stimulator (ENRAF NONIUS Endomed 484) will remain on but deliver no current. Neither participants nor evaluators will have visual access to the device display to maintain blinding. Participants will also receive a placebo needle intervention, consisting of a non-penetrating sham needle applied to the same anatomical region without skin insertion. This procedure mimics the sensation of needling but does not break the skin or produce physiological effects.

Participants will undergo a sham Percutaneous Electrical Nerve Stimulation (PENS) procedure identical in setup and duration to the active PENS group. A sterile needle (0.30 × 50 millimeters (mm)) will be inserted under ultrasound guidance (General Electric (GE) Logiq P9, General Electric Healthcare, Milwaukee, WI, USA) at the same anatomical site and depth as in the active PENS group. However, no electrical current will be applied. The stimulator (ENRAF NONIUS Endomed 484) will remain on but disconnected from the needle to maintain participant blinding. Neither participants nor evaluators will have visual access to the device screen. Total session duration: 20 minutes.