Masticatory muscle EMGs and their self-control under stress loading in a vertical space

垂直空间应力加载下咀嚼肌肌电图及其自我控制

基本信息

批准号：
20592276
负责人：
FUJISAWA Masanori
金额：
$ 2.5万
依托单位：
Meikai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

项目摘要

It is known that there is a feedback-loop between the faculty of sight and posture control against gravity fluctuation (GF). However, the effect of masticatory muscle contraction on posture control is not well understood. We used 3-D motion pictures in a virtual space with GF, to examine changes in GF with different mandibular positions. Tooth contact positions included light clenching (LC) and mandibular rest position (RP).Five male volunteer subjects (mean age of 22.4 years old) with no history of temporomandibular disorders (TMD) were recruited. Subjects included students at Meikai University. Electromyograms (EMGs) from both sides of the masseter, tibialis anterior (TA) and gastrocnemius muscles (GM) were recorded with an active electrode unit. Subjects were asked to stand on a GF sensor board in the virtual space. EMGs and GF were recorded during the display of a 3-D "roller coaster" animation (80sec duration). Alternation of LC and RP was performed by each subject. Prior to the experiments, all the subjects were trained to maintain 10% of maximum voluntary contraction as controlled LC under visual EMG feedback. They were then asked to maintain this position at the beginning of the LC experiment. No tooth contact was required during the RP session. Integrated EMG values were analyzed fromthe time point when the most significant postural change associated with the display occurred. The area of GF was also analyzed to determine the relationship between body balance and LC.Except for R-GM, integrated EMG showed a significant increase under LC when compared with RP. The area of GF decreased significantly under LC when compared with RP which indicated well controlled body balance. Since tibialis anterior and gastrocnemius muscles were activated significantly more in regulating body balance under light clenching conditions than in the mandibular rest position, tooth contact could contribute to the postural regulation system.

众所周知，在视力和姿势控制重力波动（GF）之间存在反馈环。然而，咀嚼肌肉收缩对姿势控制的影响尚不清楚。我们在带有GF的虚拟空间中使用了3-D电影，以检查具有不同下颌位置的GF的变化。牙齿接触位置包括轻夹（LC）和下颌休息位置（RP）。男性志愿者受试者（平均年龄为22.4岁），没有颞下颌疾病史（TMD）。学科包括Meikai大学的学生。用活性电极单元记录了咬肌，胫骨前（TA）和胃肌肌肉（GM）的两侧的骨髓图（EMG）。要求受试者站在虚拟空间中的GF传感器板上。在显示3-D“滚筒过山车”动画（80秒持续时间）时，记录了EMG和GF。每个受试者进行LC和RP的交替。在实验之前，对所有受试者进行了训练，以维持视觉EMG反馈中控制LC的最大自愿收缩的10％。然后，他们被要求在LC实验开始时保持这一位置。 RP会议期间不需要牙齿接触。从与显示相关的最重大姿势变化的时间点分析了集成的EMG值。还分析了GF的面积，以确定R-GM的身体平衡与LC之间的关系，与RP相比，LC的综合EMG在LC下显示出显着增加。与RP相比，在LC下，GF面积显着降低，这表明身体控制良好。由于胫骨前后肌肉在调节轻度夹紧条件下与下颌休息位置相比，在调节身体平衡方面的激活更大，因此牙齿接触可能有助于姿势调节系统。