A Study for Somatotype Analysis of Middle and High School Boys and Girls

To clarify relationship between those somatotypes of middle and high school students, 13 distributions of somatotype, and causes of body composition component change, those 310 of middle school and 322 of high school boys and girls were objected and their physique and body composition components were measured for Heath-carter`s somatotype classification. According to the study described above, we have observed results and concluded as follows. 1. Among those middle school students, boys showed as endomorph in 1st year, mesomorph-endomorph in 2nd year, and endomorph-mesomorph in 3rd year whereas girls showed as ecto-endomorph in 1st year and endomorph in both 2nd and 3rd year. Those high school students also showed that balanced mesomorph in 1st year boys and mesomorph-endomorph in 2nd and 3rd year boys while girls in 1st and 2nd year were endomorph and in 3rd year were mesomorph-endomorph. 2. Those specification of 13 somatotypes were distributed as mesomorph-endomorph, endo-morph-mesomorph, central, ecto-endomorph, and ectomorphic mesomorph, in order. 3. As a body composition component, fat in those middle school boys was gradually reduced but that in girls showed an intersection condition as it increases progressively, in more, those high school boys and girls showed a tendency to increase their body fat. Lean body mass (LMB) in all objects were shown to increase gradually and more fat was found when body density was low. Furthermore, as the grade (year) become higher body density in girls were shown to be lower than boy`s. 4. Both height and weight were gradually increased as they were grown and fat was found to be more accumulative in girls than boys. There some growth differences in both width and girth was found as boys showed higher growth rate. 5. Those correlations in obese components as those observed weight (height r=0.62) and LBM (fat mass r=0.65) in boys and also, fat mass (weight r=0.50) and LBM (height r=0.45, weight r=0.74) in girls were found to be significantly high (p0.0001), thus obesity was found to be higher in girls than the boys.