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自主肌肉活动中通过松弛任务获得抑制性控制系统的过程。2002年，研究了大鼠二头肌、肱三头肌和前臂肌肉(指伸肌和屈肌)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，研究了股直肌和股二头肌的松弛特征。由于每个研究由两个实验组成，本研究共进行了4个实验，主要结果如下：1.经过10多次实验，上臂二头肌的松弛反应模式得到了改善。2.在第一次实验和最后一次实验中，力量曲线的松弛潜伏期都在500ms左右。肌肉松弛和收缩的潜伏期之间的差异(约150毫秒。)4.小腿肌肉的肌电松弛模式受到干扰，这是由于小腿和上臂肌肉的神经-肌肉支配比例不同所致。

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.