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Verification regarding changing construction in accumulation of fat for BMI based on change with age estimated from body composition balance.
Journal of Human Ergology 2013 December
In the present study, a regression analysis of BMI and body fat percentage in each school year was performed with cross-sectional data in school-aged children. The qualitative changes in physique during the school-age years were examined by showing the changes in the level of body fat accu- mulation with age. The subjects were 789 boys and girls (469 boys, 320 girls) aged 7 to 14 years who participated in regular sports activities. Height, weight and body fat percentage were measured. Fat free mass was calculated by subtracting fat mass from body weight. BMI was calculated as body weight (kg) divided by the square of height (m). Regression analysis was conducted for fat percentage against BMI in boys and girls of all school years, and the level of body fat accumulation was considered, the distributions of the frequency of age change were examined. As a result, in the frequency distribution charts there was a shift from excessive fat to low fat from age 7 to 14 years. A χ2 test was then performed for these frequency distribution charts, and the results showed a significant difference in the frequency distribution in each year (P < 0.01). This trend was clearly in boys, and meaning was found in clarifying the changes with age in the body composition balance in boys and girls.
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