1991 Fiscal Year Final Research Report Summary
EMG Study of the Lateral Pterygoid Muscles on Isometric Horizontal Mandibular Forces
| Project/Area Number |
02670884
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
補綴理工系歯学
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| Research Institution | Osaka Dental University |
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Principal Investigator |
MAEDA Teruta Osaka Dental University, Faculty of Dentistry, Lecturer, 歯学部, 講師 (10103110)
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| Project Period (FY) |
1990 – 1991
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| Keywords | Lateral pterygoid muscle / Electromyography / Isometric contraction / Power spectrum / Muscle length / Muscle tension |
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| Research Abstract |
Experiment 1
Six male subjects were studied to determine the effect on the ENG power spectra of shortening the inferior head of the lateral pterygoid muscle (ILPT) during isometric protrusive and lateral protrusive contraction at three different muscle lengths.
Among all muscle lengths, no significant difference in mean frequency of ENG power spectra was seen on either side of the ILPT during isometric protrusive contraction. This result is similar to that for the digastric muscle during isometric under opening at various jaw positions, but differs from those for the temporal and masseter muscles at during isometric clenching at various jaw positions.
Experiment 2
The relation between frequency and amplitude on electromyograph of masseter, posterior temporal, anterior digastric and lateral pterygoid muscles on six to twenty-four normal human adults were studied during isometric contractions, at different force levels and at different muscle lengths. ENG amplitude was inversely proportional to frequency at different force levels in four muscles. However, at different muscle length, the direct proportion was shown the relation between frequency and amplitude in the masseter and temporal muscles, but there were inversely correlations between them in the digastric and pterygoid muscles.
It was speculated that this lack of significant mean frequency change and correlation between frequency and amplitude at different muscle lengths is characteristic of the EMGs of jaw depressor muscles including inferior lateral pterygoid muscle.
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Research Products
(6 results)
