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The record of the daily weight of four healthy, unmarried women between 22 and 29 years of age, and of average menstrual regularity, during a total of twenty-three menstrual periods, discloses a phenomenon which I have termed the weight wave of menstruation. This comprises the following features:
1. During several days, especially the first, preceding the menstrual flow, there occurs a progressive increase in the weight of a healthy young woman, often comprising—especially in winter—from two and one-half to five pounds, which may be from 1/2 to 5 per cent. of her usual weight. The climax of this gain is immediately followed by the rapid loss of a large part, perhaps half, of this increase in weight (often within eight to sixteen hours) and then a more gradual loss of the remainder, extending over several days (Fig. 1).
2. The menstrual flow begins during the rapid loss of weight
BELFIELD WT. THE WEIGHT WAVE OF MENSTRUATION.A PRELIMINARY NOTE.. JAMA. 1903;XL(24):1650–1651. doi:10.1001/jama.1903.92490240006002j