Body Density of Japanese Children from Age 10 to 18 Measured by the Underwater Weighing Method.

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  • 水中体重法による日本人児童・生徒(10～18歳)の身体密度について
  • Body Density of Japanese Children from

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Abstract

Children's body density has been reported to differ from that of adults mainly due to the chemical immaturation of fat-free mass. The present study was conducted to fully examine the body density of Japanese children (268 males and 332 females) from 10 years of age (4th grade in primary school) to 18 years of age (3rd grade in high school) in Nagasaki Prefecture, who were categorized by one-year age interval. Their body density was measured by an underwater weighing method to provide the basic date for estimation of body composition. The following results were obtained: 1. The subjects were taller than the national average at younger ages in both boys (11 years) and girls (10 and 11 years), though no difference was observed in other age groups. 2. The body densities in boys showed proportional relationship with age, whereas those in girlts tended to decrease with age. 3. Combining the results of the present study and other reports for Japanese and foreign subjects, body densities in boys increased in a linear fashion with aging and those in girls showed a slight decrement with aging. These tendencies were well explained by increment of fat mass in girls and increment of fat-free mass in boys. 4. A review of literature demonstrated that the equations used in estimation of body composition from density in children and adolescents should differ from those in adults. It is thus suggested that new equations specific to these age groups should be formulated.

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