Studies on processes of acquisition of relaxation and inhibitory control system during human voluntary muscle activities

本研究旨在探讨人类随意肌活动中通过放松任务获得抑制控制系统的过程。2002年，研究了肱二头肌和肱三头肌以及前臂肌肉（指伸肌和指屈肌）的松弛特征，并观察了抑制控制系统的获得过程。2003年，将研究对象转移到腿部肌肉，对股直肌和股二头肌的松弛特征进行了研究。由于每项研究由两个实验组成，因此本研究共进行了4个实验。实验得出的主要结果如下：1。上臂肱二头肌松弛的反应模式经过十多次试验得到改善。力曲线的松弛延迟时间约为500 msec。在第一次和最后一次审判中。肌肉松弛和收缩潜伏期（约150毫秒）之间的差异是显著的。据推测，取消中枢神经系统的执行命令是非常困难的。下肢肌肉肌电图上的松弛模式受到干扰，这是由于腿部和手臂肌肉之间神经-肌肉支配比例的差异。

The present studies were intended to investigate the processes of acquisition of inhibitory control system by means of the task of relaxation during human voluntary muscle activities. In 2002, the characteristics of relaxation in the muscle of biceps and triceps brachii, and forearm muscles (finger extensor and flexor) were investigated, and the processes of aquisition of inhibitory control system were also observed. In 2003, an object of the study was shifted to the leg muscles, characteristics of relaxation in the muscles of rectus femoris and biceps femoris were investigated. As each research is consisted of two experiments, total 4 experiments were conducted in the present studies.The main results are derived from these experiments as follows:1.Response patterns of relaxation in muscles of biceps brachii of upper arm are improved after more than ten trials.2.The latency of relaxation in force curve is about 500 msec.in both first trial and the last trial. The difference between the latencies of muscle relaxation and contraction (about 150 msec.) was remarkable.3.It is supposed that it is very difficult to cancel the executing command in the central nervous system.4.Relaxation patterns on EMG in lower leg muscles were disturbed, and were due to the difference of the ratio of nerve-muscle innervation between leg and arm muscles.