On the Physical Development of School Children in Seto City

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The following results have been obtained by examining the so-called "Developmental Curve" which was drawn in applying Hirata's physical judging method to the states of physical development of 706 boys and 727 girls of primary and middle schools in Seto City, Aichi Prefecture, from their first year in the primary School to the present. 1. Six cases in boys and three cases in girls were left out of consideration, as their Developmental Curves were found to be quite mysterious when examined in detail. Errors in height, weight, and girth of chest which are supposed to have come from inexactness in implements, errorneous reading of graduations, lack of training in measuring techniques or carelessness in recording or transcribing were sometimes discovered. Those in girth of chest were particularly remarkable (boys: 13.3%, girls: 9%). 2. When plain errors were corrected and the Developmental Curve of each individual closely examined, it was found that 55.4% of Height D. Curves (D. short for "Developmental "), 71.4% of Height-Weight D. Curves and 65.4% of Height-Chest D. Curves in the case of boys, and 62% of Height D. Curves; 62.7% of. Height-Weight D. Curves and 59.9% of Height-Chest D. Curves in the case of girls run nearly parallel with standard D. Curves of Height, Height-Weight and Height-Chest. 3. It was made clear on investigating* changes in the physical type that those who develop very rapidly in height are more numerous than those who delay in it (odds of 26.8% for boys and 12.4% for girls), and that most of the boys and girls grow up without causing a marked change in the degree of stoutness or thinness and the degree of wideness or narrowness of the chest (91.6% and 87.3% for boys and 90.3% and 83.7% for girls). This means that the physical type which existed in one's lower school days continues in most cases without much alteration till the time of one's graduation from the middle school. Therefore, the idea that, if only one's height developmen is normal, the degree of stoutness or thinness and that of wideness or narrowness of the chest are of no importance, is inappropriate. 4. When one develops rapidly in height, it has been found that one tends to become stout and of wide chest rather than thin and narrow-chested. 5. So-called delicate health is found to be frequent among school children with retarded physical development, or with abnormal physical development; and those of abnormal physical constitution have a strong tendency to become thin and of narrow chest. 6. The undesirable effects of ceramics, the main industry of Seto City, upon the health are very remarkable, and the physiques of children, though being gradually improvedsi nce the endo f the war, yet havea tendenctyo thin typea nd narrowc hest, which makes vigorous guidance and assistance much to be desired. 7. In a word, it is absolutely necessary for us to draw up Developmental Curve by Hirata's physical judging method, for it not only furnishes us with data concerning the degree of jphysical development, and the present state and progress of physiques of school children and enables us to give them effective guidance for bodily development, but also makes it easy for us to find errors in measuring and recording.
日本民族衛生学会の論文

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日比野佳典
平田研究所

On the Physical Development of School Children in Seto City

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