筋機能分離に関する筋電図学的研究 第1編 動物における誘発筋電図による基礎的研究

It is obvious that there are two kinds of motor units, tonic and kinetic, in the neuromuscular system following studies of many recent workers. It is not easy to differentiate them with routine EMG. In this study, it is shown that the kinetic unit contains more high frequency components than the tonic one in the EMG and an effort is made to differentiate them with a new technique with high cut filter which eliminates harmonies in the EMG. Twenty two dogs were used for fundamental experiments and the results were follows. 1) EMG spiks which are induced by cortical stimulation on the motor area with 40p.s. stimuli shows much more high frequency components than that of 20p.s. stimuli. This indicates that the kinetic motor unit contains more high frequency components than the tonic one in the EMG as it was proved by other worker that the EMG induced by cortical stimulation with 40p.s. stimuli is kinetic motor unit and with 20p.s. stimuli is tonic motor unit. 2) When the peripheral nerve is stimulated with submaximal intensity at the rate of 20p.s. stimuli, the kinetic motor unit shows a quick remarkable waning in the amplitude and after that tonic motor unit takes over. 3) Curare affects on the nerve-muscle junction (end plate) of the tonic motor unit. 4) Succinyl choline chloride affects on the nerve-muscle junction (end plate) of the kinetic motor unit.