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The Body Composition, Somatotype Feature and the Comparison Research on the Body Fat Percentage Speculate Methods in the 12 to 15 Years Old of Different Developmental Types

Author: YangYong
Tutor: ZhangDaChao
School: Henan University
Course: Human Movement Science
Keywords: Youth medium-term Developmental type Body type Percentage of body fat Approach to inferring
CLC: G804.49
Type: Master's thesis
Year: 2011
Downloads: 124
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Abstract

Due to the gap between the life age and biological age at puberty there are different types of development, in the age of onset of puberty, the end of the age as well as the development of speed, there are significant differences in the degree of development, so that the individual in body composition and body The difference is also evident. 12-15 years of age and puberty a critical period of the entire children and adolescents, the differences of the different developmental patterns of children and adolescents, their body fat content, fat-free mass, and fat content of the different parts of the proportion of total body fat content and its distribution also great, there are significant differences between men and women. In this study, aged 12 to 15 young people of different developmental type body composition changes and distribution law, as well as body development law, and body shape, and skinfold thickness method (ST), bioelectrical impedance analysis (BIA), dual-energy X-ray absorptiometry method (DEXA) for simultaneous testing of the same subjects DEXA measurements of school marked, system, to compare objectively test method, analysis and assessment, in order to establish the body fat of development rules for Chinese children and adolescents aged 12 to 15 approach to inferring. In this study, the same can evaluate for future national students' physical condition, and eventually build a evaluation system for body fat composition of different groups of people in China to lay the theoretical and practical foundation. The study selected 70 one middle school in Beijing normal healthy students (living age for men 13 to 15 years old, female 12 to 14 years old) study of 150 people, including 69 men and women 74. Studies shooting hand carpal X-ray films, according to China 05 to determine their bone age, bone age minus the life age difference is fixed for the life of the age is greater than or equal to 1 as early as the development group of the same sex the same ages of life, greater than -0.5 is less than 0.5, as a normal development group, equal to or less than -1 given late developmental group. Measurement the research object eight parts of the body skin fold thickness, bioelectrical impedance measurements and dual energy X-ray absorptiometry measurements of the systemic body fat content and body fat rate. Analysis of different developmental type the youth body composition variation, distribution and Heath-Carter Body law, and comparative analysis of three different methods of measurement and estimation of the difference of the percentage of body fat, found :1,12-15-year-old boys and girls of different developmental patterns, each there are significant differences in morphological index, body composition, the eight parts skinfold thickness and body fat distribution, and the difference was with ontogeny maturity level of synchronization change. 2,13-15 years old different developmental type boys the systemic body fat is mainly distributed in the two parts of the lower extremities and torso, trunk fat content is greater than the lower extremity fat content and early development group, the normal development of the group and the late development group are lower extremity fat content in the torso fat content; 12-14 year old girl systemic body fat is mainly distributed in the two parts of the lower limbs and trunk, three developmental types are the torso fat content greater than lower extremity fat content. 13-15 year-old boys of different developmental patterns, early development group Body clear bias in favor of partial mesoderm endoderm, the normal development of the group Body bias balanced ectoderm, the late development group Body clear bias in favor of balanced ectoderm; 12-14 year old girl early development group Body clear bias in favor of partial mesoderm endoderm, ectoderm endoderm biased partial Body of the normal development of the group, the late development group Body clear bias in favor of partial endoderm ectoderm. Factor value 4,12-15 year-old boys and girls of different developmental patterns early development group gt; normal development group gt; the late development group;-factor value in the early development group gt; normal development group gt; late development group; outside factor value , early development groups lt; normal development group lt; late development group. Difference mainly reflected Body 5,12-15 year-old boys and girls of different developmental patterns, including factor and the factor; developmental group of boys and girls as early as within the factor value significantly greater than the late developmental group, the outer factor value is significantly less than the late developmental group . 6,13-15-year-old boys of different developmental type size difference mainly due to the iliac crest and the upper part of skinfold thickness, corrected upper arm circumference and the HWR index changes; caused the main reason for the size difference of the 12-14 year-old girls of different developmental patterns scapular skinfold thickness, corrected upper arm circumference, corrected calf, the distal femur width and the HWR index changes. Found in the comparison and analysis of the results of the body fat rate projected bioelectrical impedance analysis and skinfold thickness, bioelectrical impedance analysis or measuring skinfold thickness projected the systemic body fat rate method is feasible, but in the past the skin large error between fold thickness the presumed method speculate and measured values, and the accuracy of the results of the children and adolescents of special equipment InBodyJ20 measurement, but is not suitable for large-scale population study. 8 In this study, skinfold thickness method the projected the systemic body fat rate formula established with good reliability and validity, the specific formula is as follows: boys Fat% = 0.812 0.749х to the abdomen triceps skinfold thickness 0.393х skinfold thickness the-0.555х biceps skinfold thickness 0.337х thigh skinfold thickness girls Fat% = 14.191 0.421х iliac crest and the upper part of the skinfold thickness 0.399х chest skinfold thickness

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