Research On The Male Primary School Students’ Body Composition And Physical Growth Characteristics

Objective:This study intends to select some 7-12 year-old male primary school students as the research objects and to test their body composition and body shape index. Through the analysis of the variation regularity and the correlation of body composition and physical form along with the age. The study of the elementary students’ body shape and the changing law of the body composition can provide the theoretical basis for the physical exercise of children and adolescent, then promote the level of primary school students’ physical health.Methods:There were 383 adolescents,7-12 years old, that tested the body shape inde:height, weight and girth, and analyzed the muscle mass and the percentage of fat. To calculate each index between ages of growth in value (I.V.) and the percentage of I. V. Using the SPSS 17.0 statistic analysis software and choose the Pearson correlation analysis on all body composition and body composition index.Results:1.The mass of body fat, muscle mass, weight, height, body mass index(BMI), chest circumference, waist, hip circumference growth in 11-12 years old students are around 50% in all adolescents, especially height (37%), weight (50%), BMI (70%).2. Fat, muscle, weight respectively increased 4.8kg,10.2kg and 19.7kg and in 11-12 years old adolescents respectively increased 2.5kg,5kg,10kg. Also growing fat ratio and the body fat percentage increased.3. The bust, waist, hip circumference in 7-12 years old respectively increased 12.8cm,10.1cm,14.7cm, however, at the age of 11-12 growth 5.93cm,7.22cm.4. The relevant system of the bady fat and weight, height, body mass index, waist circumference was above 0.8 which was highly correlated.5. The corelation coefficient of height, weight index and body percentage was between 0.77 to 0.9.Conclusion:1.7-12 years old primary school male students’ body shape index and body composition index variation are the same.11 years old students are in the fast development period, and the growing of the weight is faster than the height.2. The increase in percentage of fat of 11-12 years old adolescents shows that we should focus on the change of body fat when being in the fast growth period.3. During adolescents’ development period, the hip circumference is significantly increased and greater than the bust.4. The increased body fat and the BMI, weight and waist circumference were highly consistent.