Cervical Manipulation Effects on Electromyographic Amplitude of the Masseter Muscle
Keywords:
cervical manipulation, masseter muscle, temporomandibular disorder.Abstract
Introduction: There are many treatment proposals to treat the decrease of the masseter-muscle activity, such as the use of Botox, which has limited effectiveness time, massages and physiotherapy. Cervical manipulation is an effective and safe strategy to decrease the electrical activity of the masseter muscle.
Objective: To identify the immediate effects of cervical manipulation on the electromyography amplitude of the masseter muscles.
Methods: An experimental explanatory study was carried out. Through a negative Klein test of the vertebral artery, 12 subjects were selected. They aged 17 to 21 years (20 ± 2.5 years), healthy first-year students of the School of Kinesiology of the Universidad de Las Américas, in Chile. The electrical activity of the right and left masseter muscles was evaluated through surface electromyography before and after cervical manipulation and placebo manipulation.
Results: A decrease in the electromyographic activity of the masseter muscles was observed immediately after cervical manipulation, although a statistically significant decrease could only be observed in the left masseter (p value 0.04).
Conclusions: Cervical manipulation could help treating temporomandibular dysfunctions, by observing a decrease in the electromyographic activity of the masseter muscles. The importance of caution in interpreting the results is emphasized, due to the small sample size presented in this study.
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References
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