The relationship between electromyograph and energy metabolism in masseter mucles of TMD patients

本研究的目的是验证TMD患者咬肌粘液肌电与能量代谢的关系。将肌电数据与31P-MRS能量代谢数据进行对比分析，结果如下：1.疲劳负荷前后，肌电功率谱分析结果与31P-MRS分析结果基本一致。提示：1.肌电功率谱分析可以揭示咬肌的肌肉疲劳和能量代谢状态。在肌电咀嚼节律分析中，TMD患者咀嚼节律变异系数(CV)均值高于正常人。但CV分析结果与31P-MRS分析结果相关性不大。TMD患者咀嚼肌痛和痉挛的间期/周期比值均值高于正常对照组。间期/周期分析结果与31P-MRS能量代谢分析结果具有相关性。在1例TMD患者中，31P-MRS分析显示治疗后肌肉疲劳有所改善，但间期/周期比值没有明显变化。该例患者治疗前爆发率基本在正常范围，表现为爆发区边缘不明显，爆发期异常扩大。治疗后爆裂边界清晰，爆裂形态正常。这一结果表明，间隔/周期时间比的分析必须与起爆形状分析一起进行。

The purpose of this study was to verify the relationship between electromyograph (EMG) and energy metabolism in masseter mucles of TMD patients. The EMG data were compared with energy metabolism data analyzed by 31P-MRS (Magnetic Resonance Spectroscopy).The results were as follows ;1. Before and after fatigue-loading, the power spectral analysis of EMG showed the similar tendency to 31P-MRS analysis. It was suggested that the power spectral analysis of EMG might reveal the state of muscle fatigue and energy metabolism in masseter muscle.2. In the chewing rhythm analysis by EMG,the mean of CV (coefficiency of variation) in TMD patients suffering from pain and contracture of masseter muscles was higher than that in normal subjects. But there was little correlation between the result of CV analysis and that of 31P-MRS analysis.3. The mean of interval/cycle time ratio in TMD patients suffering from pain and contracture of masseter muscles was higher than that in normal subjects. The result of interval/cycle time analysis was correlative with the result of energy metabolism analysis by 31P-MRS.4. In one TMD patient, 31P-MRS analysis showed improvement of muscle fatigue after treatments, but interval/cycle time ratio was not changed evidently. In this patient, the ratio before treatment was almost in nomal range, because the border of burst was not obvious and the duration of burst was enlarged abnomally. After treatment the border of burst became clear and the burst shape became normal. This results suggest that the analysis of interval/cycle time ratio must be done together with the burst shape analysis.