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Activation pattern masticatory muscles in dysphonics woman
D Rodrigues-Bigaton1, A Schwarzenbeck, K C S Berni
1Methodist University of Piracicaba, São Paulo, Brazil. drodrigues@unimep.br
Electromyography and Clinical Neurophysiology
|November 11, 2010
Summary
Dysphonic women exhibit altered masticatory muscle activation patterns. Specifically, increased resting activity and co-contraction were observed in these individuals compared to healthy controls, indicating potential neuromuscular dysfunction.
Area of Science:
- Neurology
- Speech Pathology
- Biomechanics
Background:
- Dysphonia, a voice disorder, may be associated with altered neuromuscular function.
- Masticatory muscles play a role in speech production and airway protection.
Purpose of the Study:
- To investigate the electromyographic (EMG) activation patterns of masticatory muscles in women with dysphonia.
- To compare muscle activity between dysphonic and healthy individuals.
Main Methods:
- Electromyography (EMG) was used to assess the activity of masseter, temporal, and suprahyoid muscles.
- Seventeen women (10 with dysphonia, 7 healthy controls) participated.
Main Results:
- Dysphonic women showed increased resting EMG activity in all assessed masticatory muscles compared to controls.
- Significant differences were found in right masseter (decreased) and suprahyoid (increased) activity.
- Elevated co-contraction of mandible depressor muscles was observed in the dysphonic group.
Conclusions:
- Dysphonia is associated with abnormal activation patterns in masticatory muscles.
- These findings suggest a potential link between voice disorders and orofacial neuromuscular changes.
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