SOME OBSERVATIONS ON THE RELATIONSHIP BETWEEN WEIGHT CHANGES FOLLOWING SODIUM RESTRICTION AND THOSE ASSOCIATED WITH THE MENSTRUAL CYCLE IN NORMAL YOUNG WOMEN

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Abstract
Profiles of the daily wts. of 14 normal young women during 35 consecutive days show distinctive individual patterns. Menstrual and intermenstrual wt. peaks were noted. A point of minimal wt. usually occurred 7-12 days after the onsef of menstruation. Duplicate Na withdrawal tests were later carried out on the same subjects. The degree of wt. lost following Na restriction was similar to that previously observed in young men. There was no indication that menstrual wt. fluctuations mask or distort the response to Na withdrawal. Individuals showing wide wt. swings during the menstrual cycle tended to be "large losers" following Na withdrawal while those with less marked menstrual wt. fluctuations tended to be "small losers".