Body composition trajectories into adolescence according to age at pubertal growth spurt
✍ Scribed by Anette E. Buyken; Katja Bolzenius; Nadina Karaolis-Danckert; Anke L.B. Günther; Anja Kroke
- Book ID
- 101442445
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 218 KB
- Volume
- 23
- Category
- Article
- ISSN
- 1042-0533
No coin nor oath required. For personal study only.
✦ Synopsis
Objective: To investigate whether the development of body composition into adolescence differs among children with an early, average, or late pubertal growth spurt (age at take-off [ATO]).
Methods: Mixed-effect polynomial models were applied to serial anthropometric measurements spanning from 4 years before to 4 years after ATO in 215 DONALD participants. Sex-specific trajectories of fat mass index (FMI, FM/m 2 ), fat-free mass index (FFMI, FFM/m 2 ), and their z-scores were compared among those with an early, average, or late ATO.
Results: Compared with girls with a late ATO (reference group), those with an early or average ATO experienced a significant increase in FFMI z-scores [b (standard error) for linear trends in early and average ATO group: 10.15 (0.05) FFMI z-scores/year (P 5 0.001) and 10.11 (0.04) FFMI z-scores/year (P 5 0.005), respectively, adjusted for early life factors]. Similar differences were observed in boys [adjusted b (standard error): 10.20 (0.06) FFMI z-scores/year (P 5 0.0004) and 10.07 (0.05) FFMI z-scores/year (P 5 0.1), respectively]. Graphical illustration of the predicted trajectories revealed that differences in relative FFMI emerged from ATO onward. For FMI, comparison with late maturers showed a more pronounced quadratic trend (kg/m 2 /years 2 ) (P 5 0.01) among early-maturing girls and a reduced linear trend in FMI z-scores/year (P 5 0.04) among early-maturing boys.
Conclusions: This longitudinal study suggests that children who experience an early pubertal growth spurt accrue progressively more fat-free mass during the first years of puberty than late-maturing peers of the same age. Higher levels of adiposity commonly observed in adults with early puberty onset are, thus, likely to develop subsequently in later adolescence. Am.