Onset Of Adolescent Growth Spurt Research Articles

Trends in growth and developmental tempo in boys aged 7 to 18 years between 1966 and 2012 in Poland.

To assess trends in growth in different developmental periods and trends in developmental tempo in Polish boys between 1966 and 2012. Data on 34 828 boys aged 7 to 18 years were collected during Polish Anthropological Surveys conducted in 1966, 1978, 1988, and 2012. Biological parameters, related to onset of adolescent growth spurt (OGS) and peak height velocity (PHV), were derived from a Preece-Baines 1 model (PB1). Childhood (height at 7 years of age), pre-adolescent (height at OGS) and adolescent growth (adult height minus height at OGS) were identified. Positive secular trend between 1966 and 2012 in adult height accounted for, on average, 1.5cm/decade, with varying intensity between the Surveys. Decline in both age at OGS and APHV between 1966 and 2012 (1.5 and 1.4 years, respectively) indicated an acceleration in developmental tempo, on average, by 0.3year/decade. Increases in the contribution to the trend in adult height gained during growth in particular developmental periods between 1966 and 2012 were as followed-childhood: 0.6%, pre-adolescent growth: -3.1%, adolescent growth: 3.1%. Secular trend in developmental tempo and growth among boys reflects changes in living conditions and socio-political aspirations in Poland during nearly 50 years. Acceleration in tempo is already visible at age at OGS, whereas the trend in adult height occurs largely during adolescence, pointing to different regulation of developmental tempo and growth in body height. This finding emphasizes the importance of extending public health intervention into children's growth up until adolescence.

Height Reduction Among Prenatal Exposed Atomic-bomb Survivors

Using a random coefficient regression model, sex-specific longitudinal analyses of height were made on 801 (392 male and 409 female) atomic-bomb survivors exposed in utero to detect dose effects on standing height. The data set resulted from repeated measurements of standing height of adolescents (age 10-18 y). The dose effect, if any, was assumed to be linear. Gestational ages at the time of radiation exposure were divided into trimesters. Since an earlier longitudinal data analysis has demonstrated radiation effects on height, the emphasis in this paper is on the interaction between dose and gestational age at exposure and radiation effects on the age of occurrence of the adolescent growth spurt. For males, a cubic polynomial growth-curve model applied to the data was affected significantly by radiation. The dose by trimester interaction effect was not significant. The onset of adolescent growth spurt was estimated at about 13 y at 0 Gy. There was no effect of radiation on the adolescent growth spurt. For females, a quadratic polynomial growth-curve model was fitted to the data. The dose effect was significant, while the dose by trimester interaction was again not significant.

Determinants of trunk abnormalities in adolescence.

The relationship between gender, anthropometric factors, adolescent growth, maturation and incidence of trunk abnormalities was studied in 2819 children who were symmetric at baseline examination. At age 11 years and at age 13 years, data on height, weight, onset of adolescent growth spurt, pubertal phase and menarche were collected and examination for trunk abnormalities was performed. Data analysis included calculation of 2-year cumulative incidence and relative risks (RR) of trunk abnormalities. Two-year cumulative incidence was 11%. The RR for boys was 0.78 (95% confidence interval (CI): 0.63-0.96) compared to girls. Height was the strongest predictor for the development of trunk abnormalities in both sexes. The RR increased after adjustment for weight, onset of growth spurt, pubertal phase, and menarche. The RR was higher for girls with onset of adolescent growth spurt compared to girls who had not yet started their adolescent growth spurt (RR = 1.45, 95% CI: 1.08-1.95). For girls who had reached menarche, the RR was 0.48 (95% CI: 0.24-0.96) compared to those who had not reached menarche. Our findings suggest that taller 11 year old girls with onset of adolescent growth spurt have increased risk of future trunk abnormalities, but that having reached menarche has a protective effect.

身長発育速度曲線のパターンの検討 : 韓国青少年の縦断データによる

Twelve years of longitudinal data of standing height; ages from 6 to 17 years of Korean urban and rural schoolchildren (617 boys, 688 girls) who were born in 1963 were grouped according to their peak height velocity ages (PHV age) into 11 groups for boys and 8 groups for girls. Grand mean velocity and group mean velocity for each PHV age group were calculated. The velocity curves estimated from grand mean velocity were compared against those from group mean velocities, and patterns of group mean velocity curves were classified in terms of the characteristic of occurance of peak height velocity and the time difference between the onset of adolescent growth spurt and peak height velocity. General differences in patterns between grand mean velocity and group mean velocity curves were found in the following points; 1) amount of peak height velocity, 2) time difference between the onset of adolescent growth spurt and the occurance of peak height velocity, 3) appearance of double peaks in height velocity. Group mean velocity curves were classified into two patterns which were characterized by single peaked height velocity and double peaked height velocity, and four different patterns according to the time difference between the onset of adolescent growth spurt and the occurance of peak height velocity. It wad confirmed that the earlier occurnnce of peak height velocity is associated with a larger magnitude of the peak height gain and the amount of ado1escent growth spurt.