Photobiomodulation Therapy on Inflammatory Mediators on Low Back Pain

Study Overview
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Brief Summary
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Low back pain (LBP) is ranked as one of the most prevalent health conditions. It is likely that some inflammatory mediators could be associated with pain and disability in these patients. Photobiomodulation therapy (PBMT) is a non-pharmacological therapy often used in patients with LBP that decrease release of inflammatory mediators and accelerate muscle repair in different muscle skeletal conditions, as mechanisms of action. The present research project aims to evaluate the effects of PBMT on systemic levels of inflammatory markers and levels of pain intensity in patients with chronic non-specific low back pain.

Detailed Description
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This is a randomized, triple-blinded (therapist, assessor and patient), placebo-controlled trial, with voluntary patients with non-specific chronic low back pain. Eighteen patients will be randomly allocated to two treatment groups: Placebo or PBMT and one single session of treatment will be provided. The data will be collected by a blinded assessor and the outcomes of interest it will be levels of inflammatory markers and pain intensity and it will be collected at baseline and 15 minutes after the single session of treatment. The statistical analysis will follow the intention-to-treat principles. The findings will be tested for their normality using the Shapiro-Wilk test. Parametric data will be expressed as mean and standard deviation and non-parametric data as median and respective upper and lower limits. Parametric data will be analyzed by two-way repeated measures analysis of variance (ANOVA; time versus experimental group) with post-hoc Bonferroni correction. Non-parametric data will be analyzed using the Friedman test and, secondarily, the Wilcoxon signed-rank test.

Official Title
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Effects of Photobiomodulation Therapy on Inflammatory Mediators in Patients With Chronic Non-specific Low Back Pain: a Randomized Placebo-controlled Trial

Conditions
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Low Back Pain

Intervention / Treatment
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* Device: Placebo PBMT
* Device: Active PBMT


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: patients with chronic non-specific low back pain (defined as pain or discomfort between the costal margins and the inferior gluteal folds, with or without referred symptoms in the lower limbs, for at least 3 month); with a pain intensity of at least 3 points measured by a 0-10 points pain numerical rating scale; aged between 18 and 65 years; Exclusion Criteria: evidence of nerve root compromise (i.e. one or more of motor, reflex or sensation deficit); serious spinal pathology (such as fracture, tumor, inflammatory and infectious diseases); serious cardiovascular and metabolic diseases; previous back surgery; pregnancy. severe skin diseases (eg. skin cancer, erysipelas, severe eczema, severe dermatitis, severe psoriasis and severe hives lupus);

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 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: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Placebo Comparator: Placebo PBMT<br>Application of PBMT (Photobiomodulation Therapy) without any dose (0 Joule). | Device: Placebo PBMT<br>* The PBMT treatments will be performed using the Multi Radiance Medical™ Super Pulsed Laser MR4™console (Solon, OH, USA), with the LS50 (emitter with an area of 20 cm2) and SE25 (emitter with an area of 4 cm2) cluster probes as emitters. Nine sites will be irradiated at patient's lumbar region: 3 central sites, using the SE25 (without any dose, 0 J); and 6 sites in the same direction, but laterally (both sides, 3 at a side), using the LS50 (without any dose, 0 J). Patients will be treated in a single session and they will receive a total dose of 0 J.<br>|
| Active Comparator: Active PBMT<br>Application of PBMT (Photobiomodulation Therapy) active. | Device: Active PBMT<br>* The PBMT treatments will be performed using the Multi Radiance Medical™ Super Pulsed Laser MR4™ console (Solon, OH, USA), with the LS50 (emitter with an area of 20 cm2) and SE25 (emitter with an area of 4 cm2) cluster probes as emitters. Nine sites will be irradiated at patient's lumbar region: 3 central sites, using the SE25 (3000 Hz of frequency, 3 minutes of irradiation per site, 24.75 J per site, a totalizing 74.25 J irradiated from SE25); and 6 sites in the same direction, but laterally (both sides, 3 at a side), using the LS50 (1000 Hz of frequency, 3 minutes of irradiation per site, 24.30 J per site, a total of 145.80 J irradiated from LS50). Patients will be treated in a single session and will receive a total dose of 220.05 J.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Levels of prostaglandin E2 (PGE2) | Inflammation will be measured by blood samples | 15 minutes after the treatment | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Levels of tumor necrosis factor alpha (TNF-a) | Inflammation will be measured by blood samples. | 15 minutes after the treatment. | 
| Levels of interleukin-6 (IL-6) | Inflammation will be measured by blood samples | 15 minutes after the treatment | 
| Pain Intensity | Pain intensity will be measured by an 11-point (0-10) Numerical Rating Scale (Pain Numerical Rating Scale), with 0 being no pain and 10 the worst possible pain. | 15 minutes after the treatment. | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Low Back Pain, Photobiomodulation Therapy, PBMT, Low-Level Laser Therapy, LLLT