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Studies on voluntary muscle relaxation and inhibitory control mechanism during human voluntary simultaneous bilateral muscular contraction

人体自主同时双侧肌肉收缩过程中随意肌松弛及抑制控制机制的研究

基本信息

批准号：
11680028
负责人：
KAWABE Shoko
金额：
$ 2.11万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680028/
关键词：
relaxation bilateral force output inhibition latency inter-hemispheric inhibition 両側同時動作

项目摘要

Studies on inhibitory control in human voluntary movements were reported by mean of the task of relaxation. There are two main themes in the present research; the first theme is to investigate the influences of the magnitude of force output and mode of muscle contraction (gradual increment for tension or constant tension exertion) on inhibitory control of movement. The other theme is surround inhibition and interhemispheric inhibition. In this case inhibitory effects to the contralateral homologous muscle are investigated to compare unilateral relaxation with the simultaneous bilateral one. As each research is consisted of two experiments, total 4 experiments were conducted in the present studies. The results are derived from these experiments as follows:1. Response patterns of relaxation are varied according to the magnitude of force output.2. The latency of relaxation is clearly related with the magnitude of force output.3. The time for the initiation of decrement of tension is not affected by the magnitude of force output.4. The inhibition command is issued at a constant time from the presentation of the stimulus. However, since the command cannot completely inhibit the muscle activity when the muscle contraction is very intense, reaction times for relaxation are prolonged.5. When the muscle strength is gradually increased in pursuit of the ramp wave target, reaction times are prolonged as the frequency of the ramp wave heightened.6. Relaxation from simultaneous bilateral contraction is different from those of the unilateral.7. When only unilateral strength is relaxed during bilateral strength exertion, the contralateral tension curve is slightly rised. It seems that this phenomenon is due to the removal of the interhemispheric inhibition.

通过放松任务报告了人类随意运动抑制控制的研究。目前的研究有两个主题；第一个主题是研究力量输出的大小和肌肉收缩的方式（逐渐增加张力或恒定张力施加）对运动抑制控制的影响。另一个主题是周围抑制和半球间抑制。在这种情况下，研究对对侧同源肌肉的抑制作用，以比较单侧放松与同时双侧放松。由于每项研究由两个实验组成，因此本研究总共进行了4个实验。实验结果如下： 1．放松的反应模式根据力输出的大小而变化。2．松弛潜伏期与力量输出的大小明显相关。3．张力开始减小的时间不受输出力大小的影响。4．从刺激出现后的恒定时间发出抑制命令。但当肌肉收缩非常剧烈时，由于命令不能完全抑制肌肉活动，导致放松的反应时间延长。 5．当肌肉力量逐渐增加以追求斜波目标时，反应时间随着斜波频率的增加而延长。6．双侧同时收缩的放松与单侧的放松不同。7．双侧发力时仅放松单侧发力时，对侧张力曲线略有上升。看来这种现象是由于大脑半球间抑制的去除所致。