生体における重心高の計測並に身体発育との関係
スポンサーリンク
概要
- 論文の詳細を見る
Relation between the height of gravity center in human body and the physical elements such as body length, body weight, chest girth and sitting height has been studied on 1796 male and female subjects ranging in age from 4 to 20 years. They were residents in the district of northern Kyushu with normal health and living conditions. 1) Height of gravity center The gravity center in the male ascends with increasing age of the subjects, and it attains approximately 90 cm of height after a period of steep rise taking place from about 12 to 13 to about 15 years of age. After that the height remains nearly constant at the level of 91 to 93 cm. In the female the gravity center ascends with increasing age to approximately 82 cm, then reaches as high as about 84 cm suddenly at the age of 14 to 15 years. After that no marked change of it is observed, as alike in the case of the male subjects. 2) Relative height of gravity center The relative value in the male is aronnd 56 at four in age, then rises to around 61 at about 7 to 9 years of age which is the largest value to be attained. It then gradually decreases, showing approximate value of 55 to 60 from his puberty on toward his twenties. The female follows similar pattern, showing approximate value of 55 to 57 after about her 12 years of age. 3) Relation between body length and body weight Positive correlation exists between body length and body weight which is particularly noted in ages of vigorous development of the individual. However, the variation for each age stage and sex is rather small. 4) Relation between body length and height of gravity center Positive correlation exists between the two values in each sex group and in every age stages of the subjects in that the larger the body length, the higher the gravity center. Sex and age difference is not observed in this respect. But, in the subjects of similar body length, the gravity center in the male is higher than that in the female. 5) Relation between body weight and height of gravity center Positive correlation exists between the two values in each sex group and in every age stages of the subjects in that the heavier the body weight, the higher the gravity center, without sex and age difference to be observed. However, in the subjects of similar body weight, the gravity center in the male is higher than that in the female. 6) Relation between chest girth and height of gravity center Positive correlation exists between the two values in the subjects of both sexes and of every age stages in that the larger the chest girth, the higher the gravity center, with no appreciable difference present in regard to sexes and ages of the subjects. In the subjects 9 to 14 years of age with approximately equal value of chest girth, the gravity center in the female comes slightly higher than that in the male, but after that period, the gravity center in the male becomes higher than that in the female. 7) Relation between sitting height and height of gravity center Positive correlation exists between the two values in the subjects of both sexes and of every age stages in that the higher the sitting height, the higher the gravity center, with no appreciable difference present in regard to sexes and ages of the subjects. In the subjects older than 14 years with approximately equal value of sitting height, the gravity center in the male is generally higher than that in the female. In summary, it would be evident from the foregoings that positive correlations exist between the physical elements such as body length, body weight, chest girth and sitting height and gravity center of the body which demonstrate a certain close association with one's status of physical development with age.