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Cyclic Variations in the Basal Metabolic Rate of Women

(From the Department of Physiology, Ohio State University, Columbus.)

A study of the day-to-day variations in the basal metabolism of twenty women justifies the following conclusions:

1. There is a strong tendency for the metabolic rate to be lowered during the menstrual period.

2. A second low point in the metabolic rate occurs about the middle of the intermenstrual period.

3. In many cases the mental state of the subject seems to have a marked effect on the basal metabolic rate.

4. There seems of be a seasonal variation with the lowest metabolic rate occurring in the winter or spring and the highest in the summer or autumn. The time of year at which the metabolic rate begins to increase seems to depend to some extent on the personal habits of the subject.