近赤外分光法による咬筋内酸素飽和度の測定における誤差の検討

概要

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This study investigated measurement errors in muscle oxygenation parameters used to evaluate masseter muscle fatigue by near-infrared spectroscopy (MRS), and determined appropriate experimental conditions of occlusal force during clenching. Ten male adults with normal occlusion were selected for this study. The NIRS probe was placed on the middle part of the masseter muscle on the voluntary chewing side. Changes in oxygen saturation levels were monitored during trials of clenching for 30 seconds at 25%, 50%, and 100% of maximum voluntary contraction (MVC). The data were collected over a period of 270 seconds, from 1 minute before contraction until 3 minutes after contraction. Measurement errors of the time of appearance of the break point at 25%, 50%, and 100% MVC were 1.26s, 1.60s, and 2.25s, respectively, and the measurement errors of 1/2 recovery time were 1.43s, 1.70s, and 2.54s, respectively. At 25% MVC, one subject did not show the break point during clenching for 30 seconds. The occlusal force at 100% MVC was decreasing during clenching. The results suggest that 50% MVC is the most appropriate experimental condition to evaluate fatigue tendency of the masseter muscle induced by clenching.
2004-03-23