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The difference pattern of regulation by muscle spindles during the various cortically-induced rhythmic movements

各种皮质诱发的节律运动期间肌梭调节的差异模式

基本信息

批准号：
12470459
负责人：
HIDAKA Osamu
金额：
$ 9.02万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12470459/
关键词：
Stressor Masticatory muscle EMG Blood flow Sweat Electrocardiogram

项目摘要

It has been known empirically that under mental stress, skeletal muscle tone is increased and parafunction such as clenching or teeth grinding can be caused unconsciously, which suggests that a close relationship exists between the stomatognathic system and the mental condition. In this study, therefore, we investigated what the effect of mental stress on the stomatognathic system is and what the effect of occlusal splints is.Healthy adult volunteers participated in this study. A letter identification task over a 2-hour period was employed as a stressor. Electromyographic records were taken from the temporal and masseteric muscles, sweat rates from the palmar surface of index finger and from forehead, skin blood flow from the palmar surface of index finger, local muscle oxygenation from the masseter muscle. Assessment of autonomic function was made by heart rate spectral analysis. Two occlusal splints of different hardness were employed.During the mental task, the integrated EMG activity of masseteric and temporal muscles, tissue hemoglobin O_2 saturation (StO_2), and the Lo/Hi ratio (a marker of sympathetic activity) increased as compared before the mental task. These increases were statistically significant after at least 30 to 60 minutes ; afterwards no notable changes were found. The integrated skin blood flow and sweat expulsion did not change significantly. The integrated temporal EMG activity and Lo/Hi ratio increased with the soft splint, but did not with the hard splint. These results indicate that the hardness of an occlusal splint can affect the masticatory muscle activity and autonomic nervous system activity under stressful conditions.

据经验可知，在精神压力下，骨骼肌张力增加，并且可以无意识地引起诸如紧咬或磨牙的功能异常，这表明口颌系统与精神状态之间存在密切关系。因此，在本研究中，我们调查了精神压力对口颌系统的影响以及咬合板的影响。一个字母识别任务超过2小时的时间内被聘为应激源。肌电记录取自颞肌和咬肌，出汗率取自食指掌面和前额，皮肤血流量取自食指掌面，局部肌肉氧合取自咬肌。自主神经功能的评估是通过心率频谱分析。实验结果表明，在心理任务过程中，咀嚼肌和颞肌的肌电活动、组织血红蛋白氧饱和度（StO_2）和Lo/Hi比值（反映交感神经活动的指标）均较心理任务前增加。这些增加在至少30至60分钟后具有统计学显著性;之后没有发现显著变化。综合皮肤血流量和汗液排出没有显著变化。软夹板组颞肌肌电积分活动和Lo/Hi比值增加，而硬夹板组无明显变化。这些结果表明，咬合板的硬度可以影响咀嚼肌的活动和自主神经系统的活动在应激条件下。