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

本研究的目的是验证肌电图（EMG）与TMD患者咬肌黏液能量代谢的关系。将肌电图数据与31P-MRS（磁共振波谱）分析的能量代谢数据进行比较。实验结果如下：1.实验结果表明：疲劳加载前后的肌电功率谱分析与31P-MRS分析具有相似的趋势。肌电功率谱分析可以反映咬肌疲劳状态和能量代谢情况。肌电图咀嚼节律分析中，咬肌疼痛和挛缩的TMD患者的CV（变异系数）平均值高于正常人。但CV分析结果与31P-MRS分析结果相关性不大。有咬肌疼痛和挛缩的TMD患者的间隔/周期时间比平均值高于正常人。间隔/周期时间分析结果与31P-MRS.4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，但间隔/周期时间比无明显变化。本例患者治疗前的比值基本在正常范围内，因破裂边界不明显，破裂持续时间异常延长。经治疗后，破裂边界清晰，破裂形态恢复正常。这一结果表明，间隔/周期时间比的分析必须与爆裂形状的分析一起进行。

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.