Previously a report was made on the physiological investigations on "choking" in Judo, in which the influence to the various physiological processes were studied. The effect of "choking" on the circulatory System was studied by investigating changes in blood pressure, heart rate, electrocardiogram, and peripheral blood vessels. According to this report the heart rate is increased in the getting ready position, decreased when the subject loses consciousness and increased upon awakening. The systolic and diastolic pressures are slightly increased in the getting ready position, and markedly increased upon awakening. Blood pressure measurement during the unconscious stage was hindered due to convulsions, and could not be ascertained. The reactions of the peripheral vessels during "choking" are manifested by contractions in the skin blood vessels and dilatations in the muscle blood vessels. These phenomena may not have a direct relation to the unconsciousness resulting from "choking". On the other hand, however the fact that in highly sensitive individuals the Stimulation of the carotid sinus causes unconsciousess, it cannot be affirmed that there is absolutely no relationship. Ikai et al state that the unconsciousness resulting from "choking" is caused by anoxia in the cerebral cortex, and that the manifestations in the circulatory System are attendant phenomena. In the present study in order to analyse the mechanism of the various circulatory manifestations, investigations were made on changes in the span of heart beat, thereby determining the cardiac output. The changes in the circulatory system which occur during "choking" depend upon the part where the pressure is applied. Since it is difEcult to determine the exact spot where the pressure is being applied, the same individual was used to perform all the "choking" act, and always in the same manner. The reactions in the circulatory system appeared in the heart, and in the peripheral blood vessels. The changes in the peripheral blood vessels were determined by means of the plethysmograph, and those in the heart by means of the electrocardiograph. Electrocardiographic studies revealed that the elongation in the heart rhythm is due to changes which occur during the diastolic period, and not during the systolic period. From the voltage of the R crest it was known that in the Okurieri-shime and the Katajuji-shime the heart approaches the vertical position. Blood pressure was found to be increased after awakening. To fully understand the above results it is necessary to know the changes in the return flow of blood to the heart, and also the cardiac output during the whole process of being "choked". To make these measurements directly is impossible under the circumstances, therefore resort was made to X-ray cinematography, whereby changes in the size of the heart, and changes accompanying each heart beat could be determined.
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