Effect of Spinal Manipulation on Electromyography of the Masseter Muscle

Study Overview
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Brief Summary
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Research Problem: To know the immediate effects of high speed and low amplitude cervical manipulation on the electromyographic activity of the masseter muscles of physiotherapy students at the University of the Americas Course objective: To compare the immediate effects of high-speed, low-amplitude cervical manipulation on the electromyographic activity of the masseter muscles versus a placebo intervention in kinesiology students at the University of the Americas. Specific objectives: To describe the changes in the electromyographic activity of the masseter muscles of the high-speed cervical manipulation group in students of the physiotherapy school of the University of the Americas of the Santiago Centro campus. To describe the changes in the electromyographic activity of the masseter muscles of the placebo group in students of the physiotherapy school of the University of the Americas of the Santiago Centro campus. Methodology: Single-blind, randomized clinical trial. Expected results: Significant differences are expected between the intervention group and the control group. This is reflected in a decrease in electromyographic activity in the masseter muscles after high-speed cervical manipulation.

Official Title
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Immediate Effect of High Speed and Low Amplitude Cervical Manipulation on the Electromyographic Activity of the Masseter Muscle, in a Physiotherapy Students at the University of the Americas. a Clinical Trial, Single Blind

Conditions
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Bruxism, Muscle Disorder

Intervention / Treatment
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* Other: Cervical Manipulation
* Other: Sham Cervical Manipulation


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Male and female physiotherapy students over 18 years of age who regularly attend face-to-face classes who have a mobility pass and a health declaration. Students who read and sign the informed consent. Exclusion Criteria: Orthognathic surgery. Recent head and neck injury or fracture (equal to or less than 3 months) Dental or medical diagnosis of mandibular disorder or manifest facial pain. Contraindication (red flag) to perform high speed and low amplitude cervical manipulation (bone cancer, osteoporosis, vertebral artery injury, etc.)

Ages Eligible for Study
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Minimum Age: 18 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: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Cervical manipulation group<br>high speed, low amplitude cervical manipulation | Other: Cervical Manipulation<br>* high speed, low amplitude cervical manipulation<br>|
| Sham Comparator: Control group<br>placebo mobilization without manipulation | Other: Sham Cervical Manipulation<br>* Cervical mobilization without performing spinal manipulation<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Electromyography of the masseter muscle before intervention | surface electromyography of the masseter muscle, measured in millivolts (mV) | baseline | 
| Electromyography of the masseter muscle after the intervention | surface electromyography of the masseter muscle, measured in millivolts (mV) | 5 minute after intervention |