Doença de Parkinson é um distúrbio neurológico, crônico e progressivo que promove alterações motoras com acometimento funcional da musculatura estriada esquelética. Este estudo avaliou a força de mordida molar, atividade eletromiográfica e espessura dos músculos temporal, masseter e esternocleidomastoideo de indivíduos com e sem a doença de Parkinson. Participaram 24 indivíduos, faixa etária entre 50 e 70 anos, distribuídos em dois grupos: com a doença de Parkinson, seguindo os estágios I e III de incapacidade da escala de Hoehn e Yahr, média ± DP 66,16 ± 3,37; n = 12 (GP) e sem a doença, média ± DP 65,83 ± 3,01; n = 12 (GC). Foi utilizado o dinamômetro digital Kratos na análise da força de mordida molar máxima direita e esquerda. O eletromiógrafo MyoSystem BR1 foi usado para captação do sinal eletromiográfico nas condições posturais da mandíbula em repouso, lateralidade direita e esquerda, protrusão, apertamento dental em contração voluntária máxima com e sem Parafilm M®. A imagem da espessura muscular foi mensurada por meio do ultrassom Sono Site Titan nas condições de repouso e apertamento dental em contração voluntária máxima. Os dados obtidos foram tabulados e submetidos à análise estatística (SPSS 21.0, teste t de student; p ≤0,05). A atividade eletromiográfica e espessura muscular revelaram diferenças significantes em quase todos os músculos durante as condições posturais mandibulares entre GP e GC (p≤0,01 e p≤0,05). Essas diferenças também foram observadas na força de mordida molar máxima direita e esquerda (p≤0,01). O GP apresentou maior atividade EMG, maior espessura dos músculos temporais, menor espessura dos músculos masseteres e esternocleidomastoideos e menor força de mordida molar máxima. O entendimento de que a doença de Parkinson está associada com a função prejudicada do sistema estomatognático é extremamente importante para os profissionais da área da saúde na tomada de decisões relacionadas ao tratamento funcional reabilitador. / Parkinson\'s disease is a neurological, chronic and progressive disorder that promotes motor alterations with functional impairment of the skeletal striated musculature. This study evaluated the molar bite strength, electromyographic activity, and thickness of the temporal, masseter and sternocleidomastoid muscles of individuals with and without Parkinson\'s disease. Twenty-four individuals, aged between 50 and 70 years old, were divided into two groups: with Parkinson\'s disease, following stages I and III of Hoehn and Yahr disability, mean ± SD 66.16 ± 3.37; n = 12 (GP) and without the disease, mean ± SD 65.83 ± 3.01; n = 12 (GC). The Kratos digital dynamometer was used to analyze the maxillary right and left molar bite force. The MyoSystem BR1 electromyograph was used to capture the electromyographic signal at postural conditions of the resting mandible, right and left laterality, protrusion, maximum voluntary contraction, with and without Parafilm M®. The image of muscular thickness was measured by means of the Sono Site Titan ultrasound in the conditions of rest and dental tightening in maximum voluntary contraction. Data were tabulated and submitted to statistical analysis (SPSS 21.0, student t-test; p≤0.05). The electromyographic activity and muscle thickness revealed significant differences in almost all muscles during mandibular postural conditions between PG and CG (p≤0.01 and p≤0.05). These differences were also observed in the right and left maximal molar bite force (p≤0.01). The PG presented higher EMG activity, a greater thickness of the temporal muscles, lower thickness of the masseter and sternocleidomastoid muscles, and a lower maxillary bite force. The understanding that Parkinson\'s disease is associated with the impaired function of the stomatognathic system is extremely important for health professionals in making decisions related to functional rehabilitative treatment.

Doença de Parkinson é classificada como uma doença crônica degenerativa e progressiva, prevalecendo em indivíduos de 50 a 70 anos de idade, sendo mais comum no gênero masculino. Apresenta como principais sinais e sintomas o tremor ao repouso, bradicinesia, rigidez muscular e instabilidade postural, comprometendo a cadeia musculoesquelética. Esta pesquisa avaliou a eficiência dos ciclos mastigatórios por meio do envoltório linear do sinal eletromiográfico do músculo masseter, temporal e esternocleidomastoideo em indivíduos com doença de Parkinson. Foram selecionados 24 participantes na faixa etária entre 50 e 70 anos que foram distribuídos em dois grupos: com Doença de Parkinson (média ± DP 66,16 ± 3,37 anos, n=12) e sem Doença de Parkinson (média ± DP 65,83 ± 3,01 anos, n=12). O eletromiógrafo MyoSystem-I P84 foi utilizado para avaliar a eficiência dos ciclos mastigatórios na mastigação habitual e não habitual. Os dados foram tabulados e submetidos à análise estatística (teste t de student, p <= 0.05). Os resultados demonstraram que o grupo com a Doença de Parkinson apresentou aumento da atividade eletromiográfica durante os ciclos mastigatórios na mastigação não habitual com Parafilm M® sendo significativo para o músculo temporal direito (p = 0,01). Para a mastigação habitual de alimentos consistentes e macios houve uma maior ativação dos músculos mastigatórios e cervical para o grupo com a doença quando comparado ao grupo controle, sendo significativo para a mastigação habitual com amendoins o músculo temporal direito (p = 0,02), temporal esquerdo (p = 0,03), masseter direito (p = 0,01) e músculo esternocleidomastoideo direito (p = 0,001) e para a mastigação habitual com uvas passas o músculo temporal direito (p = 0,001), temporal esquerdo (p = 0,001), masseter direito (p = 0,001), masseter esquerdo (p = 0,03), esternocleidomastoideo direito (p = 0,001). Baseados nos resultados deste estudo pode-se concluir que em indivíduos com a Doença de Parkinson demonstrou menor eficiência na mastigação não habitual e habitual com alimentos consistentes e alimentos macios quando comparado ao grupo controle. / Parkinson\'s disease is classified as a chronic degenerative and progressive disease, prevalent in individuals from 50 to 70 years of age, being more common in the male gender. It presents as main signs and symptoms the tremor at rest, bradykinesia, muscular rigidity and postural instability, compromising the musculoskeletal chain. This research evaluated the efficiency of masticatory cycles by means of the linear envelope of the electromyographic signal of the masseter, temporal and sternocleidomastoid muscle in individuals with Parkinson\'s disease. Twenty-four participants in the age group between 50 and 70 years old were divided into two groups: Parkinson\'s disease (mean ± SD 66.16 ± 3.37 years, n = 12) and without Parkinson\'s disease (mean ± SD 65.83 ± 3.01 years, n=12). The MyoSystem-I P84 electromyograph was used to evaluate the masticatory cycling efficiency in habitual and non-habitual mastication. Data were tabulated and submitted to statistical analysis (student t test, p <= 0.05). The results showed that the group with Parkinson\'s Disease showed an increase in electromyographic activity during the masticatory cycles during non-habitual mastication with Parafilm M® being significant for the right temporal muscle (p = 0.01). For the usual mastication of consistent and soft foods, there was a greater activation of the masticatory and cervical muscles for the group with the disease when compared to the control group, being significant for the usual chewing with peanuts the right temporal muscle (p = 0.02), (p = 0.01) and right sternocleidomastoid muscle (p = 0.001) and for the habitual mastication with raisins the right temporal (p = 0.001), left temporal = 0.001), right masseter (p = 0.001), left masseter (p = 0.03), right sternocleidomastoid (p = 0.001). Based on the results of this study, it can be concluded that in individuals with Parkinson\'s disease, the efficiency of chewing is unusual and usual with consistent foods and soft foods when compared to the control group.

Doença de Parkinson é um distúrbio neurológico, crônico e progressivo que promove alterações motoras com acometimento funcional da musculatura estriada esquelética. Este estudo avaliou a força de mordida molar, atividade eletromiográfica e espessura dos músculos temporal, masseter e esternocleidomastoideo de indivíduos com e sem a doença de Parkinson. Participaram 24 indivíduos, faixa etária entre 50 e 70 anos, distribuídos em dois grupos: com a doença de Parkinson, seguindo os estágios I e III de incapacidade da escala de Hoehn e Yahr, média ± DP 66,16 ± 3,37; n = 12 (GP) e sem a doença, média ± DP 65,83 ± 3,01; n = 12 (GC). Foi utilizado o dinamômetro digital Kratos na análise da força de mordida molar máxima direita e esquerda. O eletromiógrafo MyoSystem BR1 foi usado para captação do sinal eletromiográfico nas condições posturais da mandíbula em repouso, lateralidade direita e esquerda, protrusão, apertamento dental em contração voluntária máxima com e sem Parafilm M®. A imagem da espessura muscular foi mensurada por meio do ultrassom Sono Site Titan nas condições de repouso e apertamento dental em contração voluntária máxima. Os dados obtidos foram tabulados e submetidos à análise estatística (SPSS 21.0, teste t de student; p &le;0,05). A atividade eletromiográfica e espessura muscular revelaram diferenças significantes em quase todos os músculos durante as condições posturais mandibulares entre GP e GC (p&le;0,01 e p&le;0,05). Essas diferenças também foram observadas na força de mordida molar máxima direita e esquerda (p&le;0,01). O GP apresentou maior atividade EMG, maior espessura dos músculos temporais, menor espessura dos músculos masseteres e esternocleidomastoideos e menor força de mordida molar máxima. O entendimento de que a doença de Parkinson está associada com a função prejudicada do sistema estomatognático é extremamente importante para os profissionais da área da saúde na tomada de decisões relacionadas ao tratamento funcional reabilitador. / Parkinson\'s disease is a neurological, chronic and progressive disorder that promotes motor alterations with functional impairment of the skeletal striated musculature. This study evaluated the molar bite strength, electromyographic activity, and thickness of the temporal, masseter and sternocleidomastoid muscles of individuals with and without Parkinson\'s disease. Twenty-four individuals, aged between 50 and 70 years old, were divided into two groups: with Parkinson\'s disease, following stages I and III of Hoehn and Yahr disability, mean ± SD 66.16 ± 3.37; n = 12 (GP) and without the disease, mean ± SD 65.83 ± 3.01; n = 12 (GC). The Kratos digital dynamometer was used to analyze the maxillary right and left molar bite force. The MyoSystem BR1 electromyograph was used to capture the electromyographic signal at postural conditions of the resting mandible, right and left laterality, protrusion, maximum voluntary contraction, with and without Parafilm M®. The image of muscular thickness was measured by means of the Sono Site Titan ultrasound in the conditions of rest and dental tightening in maximum voluntary contraction. Data were tabulated and submitted to statistical analysis (SPSS 21.0, student t-test; p&le;0.05). The electromyographic activity and muscle thickness revealed significant differences in almost all muscles during mandibular postural conditions between PG and CG (p&le;0.01 and p&le;0.05). These differences were also observed in the right and left maximal molar bite force (p&le;0.01). The PG presented higher EMG activity, a greater thickness of the temporal muscles, lower thickness of the masseter and sternocleidomastoid muscles, and a lower maxillary bite force. The understanding that Parkinson\'s disease is associated with the impaired function of the stomatognathic system is extremely important for health professionals in making decisions related to functional rehabilitative treatment.

Vestibular evoked myogenic potentials (VEMPs) are short-latency electromyograms evoked by high-level acoustic stimuli recorded from surface electrodes over the tonically contracted sternocleidomastoid (SCM) muscle. These responses are presumed to originate in the saccule. The purpose of this preliminary report is to provide an overview of our initial experience with the VEMP by describing the responses obtained in five subjects. Click-evoked VEMPs were present at short latencies in two normal-hearing subjects, one patient with profound congenital sensorineural hearing loss, and one patient with a severe sensorineural hearing loss due to Meniere's disease. Additionally, VEMPs were absent in a patient with profound sensorineural hearing loss following removal of a cerebellopontine angle tumor. The amplitude of the VEMP was influenced by the amount of background activity of the SCM muscle, stimulus level, and stimulus frequency. Tone-burst evoked responses showed an inverse relationship between stimulus frequency and response latency. VEMPs may prove to be a reliable technique in the clinical assessment of vestibular function.

Objective: Cervical vestibular evoked myogenic potentials (cVEMPs) are short-latency electromyogram (EMG) evoked by high-level acoustic stimuli recorded from the activated sternocleidomastoid muscle and used to evaluate otolith organ function. The purpose of this study was to investigate the effects of aging on the cVEMP and on the sternocleidomastoid muscle EMG level. Design: A cross-sectional observational study was used to investigate differences in cVEMP and sternocleidomastoid muscle EMG level in a group of 24 younger and 24 older individuals. cVEMPs were recorded during activation of the sternocleidomastoid muscle at target EMG levels ranging from 0 to 90 μV and during maximum voluntary contraction of the sternocleidomastoid muscle. Results: The sternocleidomastoid muscle EMG amplitude increased as a function of target EMG level for both age groups; however, the mean EMG amplitude was greater for the younger group than the older group, and the variability of EMG amplitude was greater for the older group. The EMG amplitude at maximum voluntary contraction ranged from 88 to 279 μV for the younger subjects and from 32 to 230 μV for the older subjects, and the mean EMG amplitude at maximum voluntary contraction was significantly greater for the younger group than the older group. The cVEMP amplitude increased as a function of EMG target level for each age group. Although cVEMP amplitude increased as a function of target EMG level for both groups, the older group exhibited smaller cVEMP amplitudes, overall, compared with the younger group. To separate the influence of EMG level from aging on cVEMP amplitude, only the responses obtained at the 30 μV target EMG level were considered for the statistical analysis because there was no significant difference in EMG level between groups at the 30 μV target level. The mean cVEMP amplitudes at the 30 μV target level were 101 and 51 μV for the younger and older groups, respectively, and a statistical analysis indicated that cVEMP amplitude for the younger group was significantly greater than the older group. Conclusions: The findings suggest that the decrement in cVEMP amplitude is related to both age-related changes in the vestibular system and age-related changes in the sternocleidomastoid muscle.

No description available.