Electromyographic´s Differences Between Dry Needling in Tonic or Phasic Skeletal Muscle Fibers.

Study Overview
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Brief Summary
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The aim of this study is to compare the surface electromyography (EGM) changes between dry needling in the upper trapezius, is a prevalence tonic fiber or lower trapezius is a prevalence phasic fiber.

Detailed Description
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Several studies already found a disturbed surface electromyography activity in myalgic muscle tissue and in the vicinity of myofascial trigger points, however studies about the effect of dry needling in this fibers type on these disturbances in EMG activity are scarce. The surface electromyography of upper trapezius is related with a tonic muscle dysfunction, for example muscle contracture; and the lower fiber of trapezius is related with atrophy muscle. Dry needling is an effective method for the treatment of myofascial trigger points for immediate reduction of pain. There are some studies about latent myofascial trigger point and motor activity, but we don't know any research about the effect of dry needling in the differences fibers.

Official Title
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Electromyographic´s Differences Between Dry Needling in Latent Myofascial Trigger Point in Tonic or Phasic Skeletal Muscle Fibers of Trapezius

Conditions
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Muscle Disorder, Trigger Point Pain, Myofascial

Intervention / Treatment
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* Other: Dry Needling in upper trapezius
* Other: Dry Needling in lower trapezius


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Presence latent myofascial trigger point in the upper/lower trapezius asymptomatic subjects Exclusion Criteria: neck or shoulder pain at the moment or 6 month ago. whiplash injury previous spine or shoulder surgery pregnancy diagnosis of radiculopathy or myelopathy

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

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: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Dry needling in upper trapezius<br>Patients receive dry needling in latent myofascial trigger point in upper trapezius. The needle was penetrated into the muscle fibers of the taut band and was moved upward and downward (fast in, fast out) in different directions with the aim to elicit LTRs | Other: Dry Needling in upper trapezius<br>* The following criteria are required for a patient to have latent TrPs: the presence of a palpable taut band in the upper trapezius muscle, the presence of a hypersensitive spot in the taut band, a palpable or visible local twitch on snapping palpation, and a no familiar reproduction of referred pain elicited by palpation of the sensitive spot. Dry needling is performed with solid filiform needles (0.30x30 mm), these needles are sterile and separately packaged. Needles are not reused and are immediately deposited in a needle container after usage. Patients receive dry needling in latent myofascial trigger point (LTRs) in upper trapezius. The needle is penetrated into the muscle fibers of the taut band and was moved upward and downward (fast in, fast out) in different directions with the aim to elicit LTRs<br>|
| Experimental: Dry needling in lower trapezius<br>Patients receive dry needling in latent myofascial trigger point in lower trapezius. The needle was penetrated into the muscle fibers of the taut band and was moved upward and downward (fast in, fast out) in different directions with the aim to elicit LTRs | Other: Dry Needling in lower trapezius<br>* The following criteria are required for a patient to have latent TrPs: the presence of a palpable taut band in the lower trapezius muscle, the presence of a hypersensitive spot in the taut band, a palpable or visible local twitch on snapping palpation, and a no familiar reproduction of referred pain elicited by palpation of the sensitive spot. Dry needling is performed with solid filiform needles (0.30x 30 mm), these needles are sterile and separately packaged. Needles are not reused and are immediately deposited in a needle container after usage. Patients receive dry needling in latent myofascial trigger point (LTRs) in lower trapezius. The needle is penetrated into the muscle fibers of the taut band and was moved upward and downward (fast in, fast out) in different directions with the aim to elicit LTRs<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Changes in surface electromyographic before and after the intervention. | Root mean square values (RMS) | Baseline and 10 minutes after the intervention | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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surface electromyographic, dry needling