Physiological Changes Accompanying Menstrual Cycle in Japanese Females

First Report: On the Surface Tension of Serum

Abstract

The author studied the flactuation of surface tension of the serumin reference to menstrual cycle. In a nursing school 8 girl-students were selected as subjects who had -experienced regular monthly cycle. Using a drop method of the author's own device, following result was obtained from 35 days' measurements.
1. The normal value of surface tension of serum in adult females was about 65 -dyne/cm.
2. Surface tension in 7 females out of 8 reduced by 1.03-3.01 per cent on a day at a time 9-12 days prior to the expected menstruation.