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CompletedNCT05138926Updated Dec 1, 2021

Effect of Spinal Manipulation on Electromyography of the Masseter Muscle

An interventional study of Cervical Manipulation and Sham Cervical Manipulation in Bruxism and Muscle Disorder, sponsored by University of Americas. Completed at 1 site in Chile. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2021-12-01.

Sponsored by University of Americas · Not applicable, Interventional, and Treatment

From the registry’s dates

  • Registered 3 months after the study started (first participant enrolled Aug 2021, registered Nov 2021).
Phase
Not applicable
Study type
Interventional
Enrollment
30
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

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.

02

Conditions studied

  • Bruxism
  • Muscle Disorder
03

In context

Muscular Diseases

280 studies on the registry are indexed under Muscular Diseases; 63 are open to participants now.

This study's enrollment of 30 is below the median of 34 across 157 interventional studies indexed under Muscular Diseases.

Browse Muscular Diseases studies →

Lead sponsor

University of Americas is the lead sponsor of 9 studies on the registry; 1 is open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes

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

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.)
05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Single (Participant)
Enrollment
30 participants (actual)

Study arms

  • Experimental
    Cervical manipulation group

    high speed, low amplitude cervical manipulation

    Other: Cervical Manipulation

  • Sham comparator
    Control group

    placebo mobilization without manipulation

    Other: Sham Cervical Manipulation

Interventions

  • OtherCervical Manipulation

    high speed, low amplitude cervical manipulation

  • OtherSham Cervical Manipulation

    Cervical mobilization without performing spinal manipulation

06

What researchers measure

Primary outcomes

  1. Electromyography of the masseter muscle before intervention

    surface electromyography of the masseter muscle, measured in millivolts (mV)

    Time frame: baseline

  2. Electromyography of the masseter muscle after the intervention

    surface electromyography of the masseter muscle, measured in millivolts (mV)

    Time frame: 5 minute after intervention

07

Study locations

1 site
  • Universidad de las Americas
    Santiago de Chile, Santiago 7750495, Chile
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Dec 1, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT05138926
Lead sponsor
University of Americas
Responsible party
Ignacio Astudillo Ganora (Physiotherapist, Phd, University of Americas) — Principal investigator
First posted
Dec 1, 2021
Start date
Aug 11, 2021
Primary completion
Nov 11, 2021
Completion
Nov 11, 2021
Last update
Dec 1, 2021

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Nov 2021. You cannot join it, but the record below documents what was studied.

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