Analgesic Mechanisms of Percutaneous Electrolysis

Percutaneous electrolysis is based on the application of a galvanic current through an acupuncture needle. The underlying mechanisms that explain the efficacy of this technique are not completely well understood. The objective is to delve into the neurophysiological analgesic effects of percutaneous electrolysis. Participants will be assigned to one of three intervention groups. The analgesic effects of the technique will be evaluated by means of variables related to endogenous pain modulation.

Participants will receive three impacts of galvanic current with an intensity of 3 mA for 3 seconds each.

The needle will be inserted into the right common extensor tendon of the epicondyle for 90 seconds without galvanic current.

A single impact of galvanic current will be applied in the common extensor tendon of the epicondyle (right side) with an intensity of 0.3 mA for 90 seconds.

Three impacts of galvanic current will be applied in the common extensor tendon of the epicondyle (right side) with an intensity of 3 mA and a duration of 3 seconds each.

PPTs will be measure by algometry in the common extensor tendon of the epicondyle, bicipital groove and tibialis anterior muscle (all of the right side).

CPM will be assess by upper extremity submaximal effort tourniquet test with algometric measures in the common extensor tendon of the epicondyle, bicipital groove and tibialis anterior muscle (all of the right side).

Assessed by Verbal Numeric Rating Scale (11-point). 10 consecutive pressures will be applied in the three previous locations (epicondyle, bicipital groove and tibialis anterior) with the algometer at the intensity of the pressure pain threshold

Inclusion Criteria: Asymptomatic subjects Signature of the informed consent Exclusion Criteria: Fear of needles Any pathology or process that causes pain Neurological, rheumatologic, cardiovascular or metabolic diseases Cutaneous alterations and cognitive or sensitivity disorders Pregnancy Recent intake of alcohol or caffeine Vigorous physical activity on the day of testing

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