scholarly journals The Relationship between Jaw Position and Masticatory Muscles' EMG Activity Based on Three Dimensional Bite Force Registration.

1996 ◽  
Vol 40 (2) ◽  
pp. 357-369 ◽  
Author(s):  
Tetsuo Kawata
Keyword(s):  
Three Dimensional ◽  
Masticatory Muscles ◽  
Bite Force ◽  
Emg Activity ◽  
Jaw Position ◽  
The Relationship

scholarly journals The influence of craniofacial form on bite force and EMG activity of the masticatory muscles. II. The three-dimensional bite force measurement system.

1991 ◽  
Vol 35 (2) ◽  
pp. 366-380
Author(s):  
Toshimitsu Iinuma ◽  
Nobuhito Gionhaku ◽  
Yoshihiko Moriya ◽  
Koji Takeuchi ◽  
Hideaki Takeuchi ◽  
...  
Keyword(s):  
Measurement System ◽  
Force Measurement ◽  
Three Dimensional ◽  
Masticatory Muscles ◽  
Bite Force ◽  
Emg Activity ◽  
Force Measurement System

scholarly journals The influence of craniofacial form on bite force and emg Activity of the masticatory muscles. I. Analysis of craniofacial forms.

1991 ◽  
Vol 35 (2) ◽  
pp. 281-289
Author(s):  
Koji Takeuchi ◽  
Toshimitsu Iinuma ◽  
Yoshihiko Moriya ◽  
Kan Hasegawa ◽  
Kurazo Kawamura ◽  
...  
Keyword(s):  
Masticatory Muscles ◽  
Bite Force ◽  
Emg Activity

Neck Muscle Synergies During Stimulation and Inactivation of the Interstitial Nucleus of Cajal (INC)

2008 ◽  
Vol 100 (3) ◽  
pp. 1677-1685 ◽  
Author(s):  
Farshad Farshadmanesh ◽  
Pengfei Chang ◽  
Hongying Wang ◽  
Xiaogang Yan ◽  
Brian D. Corneil ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Head Rotation ◽  
Neck Muscles ◽  
Head Movements ◽  
Emg Activity ◽  
Muscle Synergies ◽  
Neck Muscle ◽  
Interstitial Nucleus Of Cajal ◽  
Splenius Capitis ◽  
The Relationship

The interstitial nucleus of Cajal (INC) is thought to control torsional and vertical head posture. Unilateral microstimulation of the INC evokes torsional head rotation to positions that are maintained until stimulation offset. Unilateral INC inactivation evokes head position-holding deficits with the head tilted in the opposite direction. However, the underlying muscle synergies for these opposite behavioral effects are unknown. Here, we examined neck muscle activity in head-unrestrained monkeys before and during stimulation (50 μA, 200 ms, 300 Hz) and inactivation (injection of 0.3 μl of 0.05% muscimol) of the same INC sites. Three-dimensional eye and head movements were recorded simultaneously with electromyographic (EMG) activity in six bilateral neck muscles: sternocleidomastoid (SCM), splenius capitis (SP), rectus capitis posterior major (RCPmaj.), occipital capitis inferior (OCI), complexus (COM), and biventer cervicis (BC). INC stimulation evoked a phasic, short-latency (∼5–10 ms) facilitation and later (∼100–200 ms) a more tonic facilitation in the activity of ipsi-SCM, ipsi-SP, ipsi-COM, ipsi-BC, contra-RCPmaj., and contra-OCI. Unilateral INC inactivation led to an increase in the activity of contra-SCM, ipsi-SP, ipsi-RCPmaj., and ipsi-OCI and a decrease in the activity of contra-RCPmaj. and contra-OCI. Thus the influence of INC stimulation and inactivation were opposite on some muscles (i.e., contra-OCI and contra-RCPmaj.), but the comparative influences on other neck muscles were more variable. These results show that the relationship between the neck muscle responses during INC stimulation and inactivation is much more complex than the relationship between the overt behaviors.

scholarly journals Electromyographic activity of masticatory muscles in women with osteoporosis

2009 ◽  
Vol 20 (3) ◽  
pp. 237-342 ◽  
Author(s):  
Selma Siéssere ◽  
Luiz Gustavo de Sousa ◽  
Naira de Albuquerque Lima ◽  
Marisa Semprini ◽  
Paulo Batista de Vasconcelos ◽  
...  
Keyword(s):  
Muscle Activation ◽  
Masticatory Muscles ◽  
Voluntary Contraction ◽  
Bite Force ◽  
Emg Activity ◽  
Electromyographic Activity ◽  
Stomatognathic System ◽  
Sample Data ◽  
Clinical Conditions ◽  
Skeletal Bone

The purpose of this study was to analyze the electromyographic (EMG) activity and the maximal molar bite force in women diagnosed with osteoporosis in the maxillary and mandibular regions, considering the habits and conditions that lead to development of generalized skeletal bone loss, including on face bones, can disturb the functional harmony of the stomatognathic system. Twenty-seven women with mandibular and maxillary osteoporosis and 27 healthy controls volunteered to participate in the study. A 5-channel electromyographer was used. Muscle activity was evaluated by means of EMG recordings of the masticatory musculature (masseter and temporalis muscles, bilaterally) during the following clinical conditions: rest (5 s); right and left lateral excursions (5 s); protrusion (5 s); maximal dental clenching on Parafilm™ (4 s) and maximal voluntary contraction (4 s). This latter clinical condition was used as the normalization factor of the sample data. It was observed that individuals with osteoporosis presented greater EMG activity when maintaining mandible posture conditions and less activity during dental clenching and when obtaining maximal molar bite force. It may be concluded that facial osteoporosis can interfere on the patterns of masticatory muscle activation and maximal bite force of the stomatognathic system.

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