かみしめによる咀嚼筋疲労とその回復に関する筋電図学的研究 : 第2報正常者, 患者の疲労および回復の比較

概要

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During fatiguing clenching, power spectrum in the surface electromyogram decrease to the lower frequency. The phenomenon has been expected to indicate the fatiguing condition. However, the underlying mechanism between the muscle fatigue and the power spectrum shift is still unclear. Therefor, it may be difficult to employ the spectrum shift for the diagnostic process. The aim of this paper was to clarify the mechanism in the power spectrum shift and to find a possible parameter for diagnostic process. The shift in the mean power frequency (MPF) was observed during fatiguing clenching and the successive recovery period from a normalgroup (n=47) and a craniomandibular disorder patient group (n=46). The results suggested that the power spectrum shift during the fatiguing clenching mightbe due to a reflex inhibition at the motoneuron level. From the comparison between the normal group and the dysfunctional group, there was larger difference in the normalized absolute MPF values between the right and left muscles. Also the larger variance was seen during the fatiguing process and the recovery process in the dysfunctional group than in the normal group.
社団法人日本補綴歯科学会の論文
1989-04-01