Evaluation of energy metabolism in masseter muscles of TMD patients using 31P-MRS(magnetic resonance spectroscopy).
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<SUP>31</SUP>P-Magnetic Resonance Spectroscopy (MRS) is a non-invasive method for analyzing the intracellular metabolism of high energy phosphate compounds. In this study, <SUP>31</SUP>P-MRS was used to clarify whether the energy source was consumed in masseter muscles of TMD patients. The subjects were seven TMD patients suffering from pain and contracture of masseter muscles, and seven healthy volunteer controls.<SUP>31</SUP>P-MRS and electromyography (EMG) were performed in one side of the masseter muscles of each subject. From the obtained spectra of<SUP>31</SUP>P-MRS, phosphocreatine (PCr) /β-ATP ratios and inorganic phosphate (Pi) /β-ATP ratios were calculated. PCr acts as the energy source to reproduce ATP.<BR>The following results were obtained:<BR>1. The PCr/β-ATP ratios in TMD patients during rest (mean ratio: 1.8±0.6) were significantly lower (P<0.01) than those in the controls (mean ratio: 3.6±0.3) . This suggests that a decrease in the energy source of muscle-cells may be one of the causes of fatigue in the masseter muscles of TMD patients.<BR>2. The Pi/β-ATP ratios in the controls during clenching increased, while the ratios in the TMD patients during rest did not increase.<BR>3. There was no increase in EMG activity in the masseter muscles of the TMD patients during rest.<BR>The last two results suggest that the decrease in PCr of the TMD patients during rest was not the change that occurred during or just after acute consumption of energy such as energy consumption by clenching.
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