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Functional Analysis of the human masticatory muscles by means of the muscular sound measured with the displacement sensor, and relation to the dentofacial morphology

通过位移传感器测量的肌肉声音来分析人体咀嚼肌的功能及其与牙面部形态的关系

基本信息

批准号：
12672002
负责人：
NAKATA Shunsuke
金额：
$ 2.37万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The purpose of the present study is estimate the mechanism of muscle contraction and the condition of the muscle fatigue by means of the muscular sound (MS), the microvibration of the muscle.First, the characteristics of displacement-output voltage of the Amorphous Magnetic Sensor picked the MS up were measured. Secondly, the MS and electromyogram (EMG) of the right masseter muscle in 16 healthy male were recorded, when the eight different contraction forces (%MVC) were exerted and four %MVC after fatigue. And the amplitudes (Amp) and frequencies (Freq) of both records were analyzed. The following is the results.1. On the range of 3.0±0.1mm, the relation of displacement-output voltage of this sensor is linear.2. The Amp of the MS has been increased until 20 %MVC. Beyond its %MVC, it has been decreased.3. As the %MVC has been bigger, the power in the higher Freq band of MS has increased. However, the median Freq of power spectrum of the MS has not changed.4. After fatigue, the Amp of EMG recordings have been increased, but those of the MS have not been changed.5. The conversion efficiency (the Amp of MS / the Amp of EMG) has tended to decrease in 10 and 20 %MVC after fatigue.6. After fatigue, it became small that the powers of the higher Freq band of MS tend to increase.It is suggested that the recordings and analysis of MS is useful diagnostic tool in clinical dentistry, because the assessment of MS is get the more information of the muscle condition than EMG and muscle power.

本研究的目的是通过肌肉声（Muscle sound，MS），即肌肉的微振动来判断肌肉收缩的机制和肌肉疲劳的状态。首先，测量了采集到肌肉声的非晶磁传感器的位移-输出电压特性。其次，对16名健康男性的右咬肌施加8种不同的收缩力（%MVC）和疲劳后施加4种%MVC时的肌电（EMG）和肌电（MS）进行了记录。并对两种记录的振幅（振幅）和频率（频率）进行了分析。以下是结果。在3.0±0.1mm的测量范围内，该传感器的位移与输出电压呈线性关系. MS的最大值已增加至20%MVC。超过其%MVC，它已被减少。由于%MVC已经更大，MS的较高频带中的功率已经增加。但是，MS的功率谱的中值Freq没有变化.疲劳后，肌电记录的波幅增加，而运动员的波幅没有变化.疲劳后10%MVC和20%MVC的转换效率（MS的转换效率/EMG的转换效率）有下降的趋势.疲劳后，MS的高频功率有增加的趋势，MS的记录和分析比EMG和肌肉功率更能反映肌肉状况，因此MS的记录和分析在临床牙科诊断中具有重要的价值。