Immediate Effect of Irradiation With Low-level Laser Therapy on the Electromyographic Activity of the Upper Trapezius Muscles and the Level of Pain Among Patients With Non-specific Neck Pain

Study Overview
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Brief Summary
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The aim of the present study is to assess the immediate effect of irradiation with low level laser therapy (LLLT) on the electromyographic activity of upper trapezius muscles and the amount of pain felt by patients with non-specific neck pain (NS-NP).A total of 20 patients with non-specific neck pain will be enrolled in a randomized, single-blind, crossover study. Each subject will receive two forms of treatment in random order: a single session of LLLT and placebo LLLT. In order to eliminate carry-over treatment effects, a one-week wash-out period will be respected between sessions. Surface electromyography will be used to determine nerve conduction velocity and activity in the upper trapezius muscles before and after treatment. The outcome measures will be determined by a numerical pain rating scale. Comparisons before and after irradiation with LLLT will determine the activity of the upper trapezius muscles and the level of pain. The data will be submitted to statistical tests considering a p-value of p < 0.05.

Official Title
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Immediate Effect of Irradiation With Low-level Laser Therapy on the Electromyographic Activity of the Upper Trapezius Muscles and the Level of Pain Among Patients With Non-specific Neck Pain: a Randomized, Double-blinded, Sham-controlled, Crossover Study

Conditions
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Neck Pain Treatment

Intervention / Treatment
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* Device: low level laser therapy
* Device: Placebo low level laser therapy


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: 18 to 40 years Male and female volunteers History of neck pain for a period of more than two months Score ranging from 15 to 24 on the Neck Disability Index Score ranging from three to seven points on an 11-point (range: 0 to 10) numerical rating scale (NRS) for perceived pain intensity Exclusion Criteria: history of neurological disorders neck surgery chronic neck pain resulting from a traumatic incident chronic musculoskeletal condition medical diagnosis of fibromyalgia; systemic disease connective tissue disorder having undergone physical therapy use of analgesic, muscle relaxant.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Experimental: low level laser therapy (LLLT)<br>For the LLLT irradiation, a paper template with 9 points (area of 1cm and a distance from center to center of 1 cm) will be used, distributed in three columns and three lines. The central point of the template will be positioned above the medium point of a line traced between the acromion and the spinous process of the seventh cervical vertebra, where the treatment should be close to the fixation point of the EMG electrode. The application point of the LLLT was determined by the location of the innervation point of the upper trapezius muscle. Individuals will be subject to application of low level laser with a total dose of 18 J | Device: low level laser therapy<br>* Will be performed irradiation with low-intensity laser in upper trapezius muscle<br>|
| Placebo Comparator: Experimental: Placebo low level laser therapy (PLLLT)<br>For the PLLLT irradiation, a paper template with 9 points (area of 1cm and a distance from center to center of 1 cm) will be used, distributed in three columns and three lines. The central point of the template will be positioned above the medium point of a line traced between the acromion and the spinous process of the seventh cervical vertebra, where the treatment should be close to the fixation point of the EMG electrode. The application point of the PLLLT was determined by the location of the innervation point of the upper trapezius muscle. Individuals will be subject to application of low level laser with a total dose of 0 J | Device: Placebo low level laser therapy<br>* Will be not performed irradiation with low-intensity laser in upper trapezius muscle<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Electromyographic activity | The EMG signal will be recorded in the dominant upper trapezius muscle in patients with nonspecific neck pain, will be evaluated before and after treatment. | 1 Year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Numerical rating scale score for pain | A numerical rating scale for pain will be used to assess pain intensity in the NS-NP individuals. This is an 11-point scale ranging from 0 (absence of pain) to 10 (worst possible pain). The numerical rating scale was translated and cross-culturally adapted for the Brazilian population. | 1 Year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Low-Level Laser Therapy, trapezius muscle, neck pain