韓國人 靑少年의 身長과 體重의 成長過程에 따른 形態的 變化에 關한 硏究 = Studies on the Chronological Change and Type of Shape of Body Height and Weight in Korean Youth
The purpose of this study is to identify the physical growth in Korean. The subjects of this study include both of male and female, who are attending elementary school, middle school, high school, college in middle and large cities and rural areas. The total number of subjects was 144, 583 persons, including 76,402 persons of male and 68,181 persons of female. The researcher measured the physical status of the male and female - in terms of body height and body weight - through cross - sectional method.
On the basis of the results, calculated the standard values of each body structure, the physical and nutritional indices, fatness and estimate the standard body weight, under - and over - weight, the weight of malnutrion and obesity in accordance with age, sex and body height for decision of health level.
These surveys and measurements took for 18 months from 1 May, 1988 to 30 April, 1989, and the data from these surveys were analyzed through computer.
The results are as follows.
1. Body Measurements
1) Body height (㎝)
In the growth condition of body height, rapid growth has been observed among male in the ages 7-15 and among female 7-13. Growth in terms of body height turned out to be slower among higher ages by both sexes, and the average body height of full-grown Korean youth (20-24 age group) was 170.6±7.1㎝ for male and 159.9±6.3㎝ for female. The maximum growth age and annual increment of body height were 10-11 years old and 6.73㎝ per year for female and 11-12 years old and 6.8㎝ for male. These data show a fact thai the female starts to grow earlier than the male by about one year.
The age of crossover between the sexes come around 9.5-11.5 years of age, where upon female outgrows male.
2) Body weight(㎏)
Rapid growth. in terms of body weight, which was represented by a straight line on a growth curve was observed among the both sexes of 7-15 years of ages and growth turned out to be slower among higher ages by both sexed. The average body weight of full - grown Korean youth (20 - 24 age group) was 63.8±6.8㎏ for male and 52.95±6.0㎏ for female.
The maximum growth age and annual increment of body weight were 12 - 13 years old and 6.0㎏ per year for male and 10-11 years old and 5.6㎏ for female. Those data show a fact that the female starts to grow earlier than the male by about two year.
The age of crossover between the sexes come around 9.5-12.5 years of age, whereupon outgrows male.
2. Physical and Nutritional Indices
1) Relative body weight
Rapid growth, in terms of relative body weight, which was represented by a straight line on a growth curve was observed among the both sexes of 7 - 16 years of age and the age of crossover between the sexes come around 7 - 12.5 years of age.
2) Rohrer index
Rohrer index displayed more rich value in case of female than male and in the adolescent period, the level of fullness in lower than after the completion of development.
3) Kaup index
In both sexes, Kaup index increased in accordance with advancing ages. The index comes to under 2.02 from 7 to 14 years old in case of male and from 7 to 13 years old in case of female. So the growth of longitudinal axis seemed to be more poor than the one of vertical axis. The index increases beyond 2.0 in case of male of after 15 years old for female.
3. The Fat Amount Through the Method of Measurement of Physical Body
In 7 years of age group, the amount of body fat of male was 3.77±1.25 ㎏ and that of female was 9.49±2.24㎏. The amount in creased with age to reach for male in 20-24 age group an average 11.3±2.81㎏ and for female 14.81±2.12㎏.
In 7 years of age group, the body fat ( % ) of male was 15.35±5.14% and that of female was 18.01±2.87%. The body fat ( % ) increased with age to reach for male in 20-24 age group an average 17.63±2.67 % and 24.85±4.47 % for female. In cases of male, the body fat ( % ) of 8-13 age group indicated normal range but the other age group indicated higher range. In cases of female, the body fat (%) of below 10 age group indicated lower range and over 11 age group indicates normal range.
4. The Standard Body Weight of the Koreans
1) The standard body weight of Korean youth
In case of 7 years age group, correlation coefficient of r=+0.572(p 0.001) between body height and body weight was found in a male group of 2,358 subjects and r=+0. 353(p 0.001) was found in female group of 2,461 subjects, from which respective linear regression equation of body weight and body height was established for male and female as follow :
For male ; Y ( B. W, ㎏ )=0.4059×( B. H, ㎝ )-26.1, ( Sy. x =±3.7)
female ; Y ( B. W, ㎏ )=0.1471×( B. H, ㎝)+6.3, (Sy. x=±5.4)
Similar regression equations of body weight and height were found all age groups from 7 to 19 years old and listed in table 12.
2) Standard body weight of Koreans
A correlation coefficient of r=+0.320( p<0. 001 ) between body height and body wight was found in a 20-24 age male group of 7,659 subjects and r=+0.301( p<0.001) in a 20 - 24 female group of 6,693 subjects, from which respective linear regression equation of body weight and height was established for male and female as follows :
For male ; Y ( B. W. ㎏ )=0.306×( B. H. ㎝ )+11.6, ( Sy. x =±6.4)
female ; Y ( B. W. ㎏ )=0.2856×( B. H, ㎝)+7.3, (Sy. x=±5.7)
The standard body weight, under - and over - weight, weight of malnutrition and obestiy of Koreans calculated and listed in table 13-a and 13-b.
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