Changes in EMG activity during clenching in chronic pain patients with unilateral temporomandibular disorders
| Autor: | B. Rilo-Pousa, J. Cudeiro, Urbano Santana-Mora, María Jesús Mora-Bermúdez, J.C. Ferreira-Pinho, Urbano Santana-Penín, J.L. Otero-Cepeda |
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| Rok vydání: | 2008 |
| Předmět: |
medicine.medical_specialty
Adolescent Biophysics Neuroscience (miscellaneous) Pain Clenching Young Adult EMG medicine Humans In patient Orthodontics business.industry Electromyography Chronic pain Kaw muscles Temporomandibular Joint Disorders Control subjects medicine.disease Unilateral TMD Arthralgia Nociception Chronic disease Chronic Disease Masticatory Muscles Physical therapy Bruxism Female Neurology (clinical) medicine.symptom business Muscle contraction Muscle Contraction |
| Zdroj: | RUC. Repositorio da Universidade da Coruña instname |
| ISSN: | 1873-5711 |
| Popis: | [Abstract] The study assessed the differences in electromyographic (EMG) activity recorded during clenching in women with chronic unilateral temporomandibular disorders (TMDs) as compared to control subjects. Seventy-five full dentate, normo-occlusion, right-handed, similarly aged female subjects were recruited. Twenty five subjects presented with right side TMD, 25 presented with left side TMD and 25 pain-free control subjects participated. Using integrated surface EMG over a 1 s contraction, the anterior temporalis and masseter muscles were evaluated bilaterally while subjects performed maximum voluntary clenching. Lower EMG activation was observed in patients with TMD as compared to control subjects (temporalis: 195.74 ± 18.57 vs. 275.74 ± 22.11, P = 0.011; masseters: 151.09 ± 17.37 vs. 283.29 ± 31.87, P < 0.001). An asymmetry index (SAI) was calculated to determine ratios of right to left sided activation. Patients with right-sided TMD demonstrated preferential use of their left-sided muscles (SAI −5.35 ± 4.02) whereas patients with left-sided TMD demonstrated preferential use of their right-sided muscles (SAI 6.95 ± 2.82), (P = 0.016). This unilateral reduction in temporalis and masseter activity could be considered as a specific protective functional adaptation of the neuromuscular system due to nociceptive input. The asymmetry index (SAI) may be a useful measure in discriminating patients with right vs. left-sided TMD. Galicia. Consellería de Cultura, Educación e Ordenación Universitaria; Grant 9/7/1996/DOG/22/7/1996 |
| Databáze: | OpenAIRE |
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