抄録
The electrogram of the uterus and vagina of rats have been recorded by the implanted electrodes. The speculations have been done on the amplitude, number of spikes, length of train discharge and the interval of train discharge of the electrical activity under the administration of various hormones as well as in each phases of pregnancy, parturition and post partum rat's uterus.
At estrogen dominated rat, train discharge tends to be formed, its amplitude being 0.5-1mV, whereas at progesterone dominaied and early stage in pregnancy, the action potentials appeared irregularly and sporadically, its amplitude being 0.1-0.5 mV. At estrogen-progesterone dominated, train discharge was formed and the amplitude increased slightly as estrogen dominated rat. At the middle stage of pregnancy, the action potentials have been grouped, amplitude being increased and train discharge became shorter. At parturition stage, the electrical activity was quite regular and the amplitude being sometimes 1-2 mV. Till 3 days post partum, one group of train discharges contained much number of spikes and the amplitude being 0.5-1.0 mV. Since 7 days post partum, number of spikes decreased and the amplitude became smaller.
The electrical activity of the vaginal muscle, also has been changed under the influence of hormones like the uterine muscle does. But in the vaginal muscle burst formation of the spike discharge were poor. By the castration or the domination with hormones the water contents of the uterine muscle were remarkably changed, but the sodium contents of the muscle were decreased by castration and by the domination with estrogen it decreased further. Potassium comtents of the uterine muscle was also decreased by castration, but the estrogen dominated muscle restored its potassium content. The myometrium was more greatly influenced by these treatment than endometrium.
