EMG analysis in view of the amplitude. Amplitude distribution analysis.:—Amplitude distribution analysis—
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概要
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When surface electromyography of masticatory and neck muscles of Cranio-Mandibular-Disorders (C.M.D.) patients is carried out, a continuous spontaneous discharge with a wave pattern showing a rather small and constant amplitude may often be observed just after clenching or just before/after chewing.<BR>In the past there have been reports that stated that this spontaneous discharge was closely related to the hyperactivity of the muscles and disappeared after occlusal therapy.<BR>We believe that this spontaneous discharge is closely related to the symptoms of C.M.D.. Therefore we hypothesize that its incidence is related to the degree of the symptoms of C.M.D.. If this hypothesis is true, when we perform on patients a prescribed examination, the incidence of such discharge in a prescribed time is suitable for the parameters of evaluation of the degree of the symptoms of C.M.D..<BR>For calculating the incidence of the spontaneous discharge, it is a priority to obtain the occurrence time of it. Up to now, by the conventional method, the examiner has to distinguish subjectively between the spontaneous discharge and the discharge by voluntary contraction. A new analysis has been developed that will distinguish objectively and calculate effectively the incidence of the discharge of the muscles. This analysis, called the Amplitude Distribution Analysis, is a computer program that analyses the distribution density of voltage for all the digitalized data of some signals.<BR>In this article we explain this analysis and how we analyzed three kinds of standard signals (a square wave, a chopping wave and a sine wave) by using an oscillator.<BR>We analyzed two kinds of muscle discharges, the normal discharge during M.V.C. in subjects without signs of C.M.D., spontaneous discharge in C.M.D. patients.<BR>The results yielded by our experiment are inspiring since the amplitude distribution analysis enabled us to:<BR>1) Identify the differences of such wave forms.<BR>2) Analyze between the normal discharge during Maximum Voluntary Clenching (M.V.C.) in normal subjects with good occlusal relations and are free of C.M.D, symptoms, and the spontaneous discharge that occurs immediately after M.V.C. in C.M.D. patients.<BR>3) Evaluate the results of analyzing by half band width of this chart, half band width/peak to peak amplitude. We think that the Amplitude Distribution Analysis enables us to recognize the difference in wave forms. We anticipate it is useful for the diagnosis of C.M.D. patients.
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