Effects of Helium-Neon Laser Irradiation on Skin Resistance and Pain in Patients with Trigger Points in the Neck or Back

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Abstract
The purpose of this double-blind study was to ascertain the effects of helium-neon (He-Ne) laser irradiation on skin resistance and pain in patients with trigger points in the neck or low back. This study entailed a partial replication of a previous study by Snyder-Mackler and associates that determined the use of the He-Ne laser increased skin resistance overlying a trigger point. Twenty-four patients were randomly assigned to either a treatment or a control group and received three 20-second applications of laser irradiation or placebo “stimulation,” respectively. Pretreatment and posttreatment skin resistance and pain measurements (via visual analog scale) were taken during each session. Results indicated a statistically significant increase in skin resistance (p < .001) and a decrease in pain (p < .005) following laser treatment. There was not a significant correlation between skin resistance and pain across subjects. These data substantiate the previous findings of Snyder-Mackler and associates and demonstrate a reduction in pain. Helium-neon laser treatment, therefore, may be an effective adjunct to conventional physical therapy of these patients.

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