The equipment used, (INDIBA® activ 902, (448kHz)). The electricity was administered in the following manner: cream was applied to the site with the severe rest pain and its adjacent area, and the electrical output was increased by moving the movable electrode within the patient´s tolerance level, while monitoring the skin temperature tolerable to the patient. Therapy was conducted for 12 minutes, two times per week over four weeks (eight sessions in total)

All patients were treated with the same device in a nonfunctional application (no energy source) and the therapy was conducted for 12 minutes, two times per week over four weeks (eight sessions in total).

The equipment used, 35-mm diameter CAP and 30-mm diameter RES movable electrode was used on the affected site, and a planar electrode was used as a return electrode on the abdomen. The electricity was administered in the following manner: cream was applied to the site with the severest pain and its adjacent area, and the electrical output was increased by moving the movable electrode within the patient´s tolerance level, while monitoring the skin temperature tolerable to the patient.

Pain intensity was measured using a 100-mm visual analogue scale (VAS). This scale consists of a 100-mm horizontal line with pain descriptors ranging from "no pain" marked on the left side to "the worst pain imaginable" on the right side. The perceived pain level of the patients was measured at rest, by marking the VAS with a perpendicular line. This is a valid method to measure pain level, and psychometric properties of the VAS have been reported widely. The minimal important difference of the VAS is based on detecting an 8.6-mm difference (based on a previous study for a score < 40 mm with a pain onset of greater than 12 weeks) immediately after treatment The VAS has been documented in previous studies as having good reliability and validity.

The Neck Disability Index (NDI) was used. NDI is a self-reporting questionnaire used to determine how neck pain affects a patient's daily life. It consists of ten questions in the following domains: Pain Intensity, Personal Care, Lifting, Reading, Headaches, Concentration, Work, Driving, Sleeping, and Recreation. Each question contains six response options, scored from 0 (no disability) to 5 (complete disability). All section scores are then totaled. Scoring is reported on a 0-50 scale (0 being the best possible score and 50 the worst). The NDI has good construct validity. The NDI is seen as a valid tool to measure neck pain and disabilities in patients with neck pain due to acute or chronic conditions, as well as in patients suffering from musculoskeletal dysfunctions.