Dry Needling and Photobiomodulation in the Treatment of Myofascial Pain

The present study has the objective to evaluate the effects of dry needling and photobiomodulation application in the treatment of trigger points in upper trapezius on women with myofascial pain. The specific objectives are: 1) To evaluate the pain level before, during, and after the dry needling and photobiomodulation applications on the trigger point; 2) To identify the pain pressure threshold before and after dry needling and photobiomodulation applications on the trigger point; 3) To verify the electromyographic activity of upper trapezius before and after the proposed treatments; and 4) To compare the effects fond intra and inter-groups for the applications of dry needling, dry needling and photobiomodulation, and control protocol.

The sample will be composed by 20 subjects in each group, a total of 60 subjects, according to a convenience sample based on review studies of Cagnie at al., 2015, and Espejo-Antúnez et al., 2017.

The study will be performed at the Laboratory of Evaluation and Rehabilitation of the Locomotor Apparatus (LARAL), located at Universidade Federal de Santa Catarina, Campus Araranguá, Santa Catarina, Brazil. Women, with age between 18 and 65 years old, students, workers, and professors at Universidade Federal de Santa Catarina (UFSC) will be invited to participate in the research. The invitation of subjects to participate in the study will be done through digital and printed folders that will be delivered at UFSC and on the social media. Those subjects that show interest to participate will be forwarded to an evaluation selection where it will be identified if the participant fits the inclusion criteria and where the Consent Form will be presented.

The active trigger point in upper trapezius will be localized through manual palpation and the location will be marked with a special pen for the skin. A second mark located 1.5 centimeters medially from the trigger point will be made in all subjects. The trigger point identification will follow Simons et al. criteria, featuring 3 of 4itens: (1) presence of palpable taut band in the muscle; (2) presence of hypersensitive spot inside the taut band; (3) subject recognize the familiar pain; and (4) painful limitation of the range of motion during total stretch.

The surface electromyography (EMG) will be used to evaluate the muscle recruitment pattern. Disposable electrodes, made with polyethylene foam and with hypoallergenic adhesive, solid gel adherent, bipolar contact of Silver/Silver Chloride (Ag/AgCl), will be used and positioned with 20mm of distance between poles. The Medtrace® reference electrode will be positioned in the ipsilateral wrist of the data collection. The electrodes will be positioned in the upper trapezius muscle as recommended by Surface ElectroMyoGraphy for the Non-Invasive Assessment of Muscles (SENIAM).