Japanese Journal of Health and Human Ecology
Online ISSN : 1882-868X
Print ISSN : 0368-9395
ISSN-L : 0368-9395
Relation between the Mental and Physical Growth of Girls
Report 4. Concerning the Development of the Secondary Sexual Characteristics
Kiyoko CHIBA
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1960 Volume 26 Issue 1 Pages 48-55,A4

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Abstract

The purpose of this research is to study: (1) whether there are any special characteristics in bodily development which typify the menarche, (2) whether there are an differences in body type between girls who reach the menarche early and those who reach it late, and (3) whether, corresponding to the gradual acceleration of the age when the menarche occurs, there is a corresponding acceleration of the development of the mammary shape and axillary hair.
The sudjects of the study were 980 girls from an urban elementary, middle, and high school.
The mammary shape development scale follows Reynold's classification, and the axillary hair scale follows Tsuji's classification.
The results are as follows:
1) There are no special characteristics in bodily development which typify the menarche, but the menarche coincides with the period of greatest individual growth in height. This fact is corroborated by many writers.
2) Girls who reach the menarche early (accelerated girls) show an optimum correlation between height and weight during their growth (Types A, B, and C). By contrast, girls who reach the menarche late (retarded girls) tend to be tall and thin and to show a poor correlation between height and weight during their growth (Type E).
3) Accelerated girls reached the bud stage of mammary shape development at eight years of age. The change from an elevated areola to she first swelling of the mammary shape, and again to a small mound formation, occurs between ten and twelve years of age.
Nearly all the subjects reached a mature stage of mammary shape development at seventeen years of age.
4) The appearance of axillary hair in accelerated girls occurs at ten years of age, about two years later than the beginning of mammary shape development.
5) As compared with the results of a 1937 study concerning the beginning and the rate of development of mammary shape and axillary hair, the results of this study (1957) show: (i) similar conclusions as regards the beginning of mammary shape and axillary hair growth, but (ii) as regards the rate of development, there is an acceleration of one or two years.

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