title: The accelerated increase in lean body mass of pre-pubescent Japanese boys at 10 to 11 years of age.
abstract: The present study investigated changes in body composition in relation to growth to evaluate at what age Japanese children begin their pre-pubescent growth spurt. Children aged 9 were followed to age 10 (The age 9 group), and those aged 10 were followed to age 11 (The age 10 group). The increase in lean body mass per one-year increment of body height (Δ LBM/ ΔBH) in the age 10 boys group was significantly higher than that in the age 9 boys group. In both the age 9 and 10 boys groups, the high Body Mass Index (BMI) boys showed greater mean ΔLBM/ ΔBH than that for the normal BMI boys. Our results of accelerated Δ LBM/ ΔBH from age 10 to 11 in Japanese boys hypothesize that an increase in LBM demonstrates pre-pubescent growth.
authors: Department of Hygiene, Gifu University School of Medicine, 40 Tsukasa-machi, 500-8705, Gifu, Japan, washino@cc.gifu-u.ac.jp.
authors: K
authors: K
authors: Washino
authors: H
authors: H
authors: Takada
authors: H
authors: H
authors: Iwata