Following Ueda-Yasuda's procedure, the author observed changes on the portal blood circulation time, the blood pressure and the pulse rate of five normal men following a cold bath in water. Measurements were taken three times 30 minutes before the bath, immediately after the bath and 30 minutes after the bath (the bath was either 5 or 10 minutes in duration, and ranged in temperature from 26°to 28℃). Portal blood circulation time immediately after a 10 minute cold bath was found to be probably shortened as compared with that taken before the cold bath. The changes in blood pressure and pulse rate observed after the cold bathing were similar to those reported by other authors.
