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A total of 1, 078 records of physical examinations conducted upon the subjects' enrollment in Japan Women's College of Physical Education were investigated. The 1, 078 female student athletes were born during the period between 1953 and 1957 and entered the college between 1972 and 1975. The following results were obtained:i) Comparing the birth seasonality among three groups with different athletic ability levels, the 1st grade athletes (who had been entrants in all-Japan or international competitions) and the 2nd grade athletes (who had been entrants in Japanese prefectural competitions) were relatively less frequently born between April and July than the 3rd grade athletes (who had never been entrants in any of the above-mentioned competitions).ii) Those who were superior in athletic ability tended to have greater height, body weight and back strength and later menarche, but no significant differences in the Rohrer Index.iii) The differences by season of birth in body structure, back strength and menarcheal age were not so evident as those by athletic ability levels. However, within the 1st grade ability level, the height of those born from August to October was significantly greater, and within the 2nd grade level, significantly later menarche was seen among those born between May and July.iv) Comparing the differences in height, body weight, back strengthth and menarcheal age among the three athletic ability levels within the same season of birth, the differences by athletic ability levels tended to be larger among those born between May and July, which is the season when the fewest 1st grade athletes were born.
日本民族衛生学会の論文

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