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. 2009 Dec 24;4(12):e8450.
doi: 10.1371/journal.pone.0008450.

Age at puberty and the emerging obesity epidemic

Lise Aksglaede  1 , Anders Juul, Lina W Olsen, Thorkild I A Sørensen
Affiliations

Age at puberty and the emerging obesity epidemic

Lise Aksglaede et al. PLoS One. .

Abstract

Background: Recent studies have shown that puberty starts at younger ages than previously. It has been hypothesized that the increasing prevalence of childhood obesity is contributing to this trend. The purpose of this study was to analyze the association between prepubertal body mass index (BMI) and pubertal timing, as assessed by age at onset of pubertal growth spurt (OGS) and at peak height velocity (PHV), and the secular trend of pubertal timing given the prepubertal BMI.

Methodology/principal findings: Annual measurements of height and weight were available in all children born from 1930 to 1969 who attended primary school in the Copenhagen municipality; 156,835 children fulfilled the criteria for determining age at OGS and PHV. The effect of prepubertal BMI at age seven on these markers of pubertal development within and between birth cohorts was analyzed. BMI at seven years was significantly inversely associated with age at OGS and PHV. Dividing the children into five levels of prepubertal BMI, we found a similar secular trend toward earlier maturation in all BMI groups.

Conclusion/significance: The heavier both boys and girls were at age seven, the earlier they entered puberty. Irrespective of level of BMI at age seven, there was a downward trend in the age at attaining puberty in both boys and girls, which suggests that the obesity epidemic is not solely responsible for the trend.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. Age at OGS and PHV according to BMI.
Age at OGS (upper panel) and at PHV (lower panel) according to BMI category 1–5 divided by birth cohort. BMI category 1, 2, 3, 4 and 5 = BMI SDS: <−0.75, −0.75 to −0.25, −0.25 to +0.25, +0.25 to +0.75 and >+0.75, respectively. Note data in boys only shown from birth year 1940–69 due to a small number of samples before that time.
Figure 2
Figure 2. Age at OGS and PHV according to birth year.
Age at OGS (upper panel) and at PHV (lower panel) according to year of birth. Wide lines represent data on the whole cohort including confidence intervals, whereas the slimmer lines represent data on children according to BMI category 1–5. BMI category 1, 2, 3, 4 and 5 = BMI SDS: <−0.75, −0.75 to −0.25, −0.25 to +0.25, +0.25 to +0.75 and >+0.75, respectively. Note data in boys only shown from birth year 1940–69 due to a small number of samples before that time.
See this image and copyright information in PMC

References

    1. Parent AS, Teilmann G, Juul A, Skakkebaek NE, Toppari J, et al. The timing of normal puberty and the age limits of sexual precocity: variations around the world, secular trends, and changes after migration. Endocr Rev. 2003;24:668–693. - PubMed
    1. Aksglaede L, Olsen LW, Sørensen TIA, Juul A. Forty years trends in timing of pubertal growth spurt in 157,000 Danish school children. PLoS ONE. 2008;3:e2728. - PMC - PubMed
    1. Herman-Giddens ME, Slora EJ, Wasserman RC, Bourdony CJ, Bhapkar MV, et al. Secondary sexual characteristics and menses in young girls seen in office practice: a study from the Pediatric Research in Office Settings network. Pediatrics. 1997;99:505–512. - PubMed
    1. Herman-Giddens ME, Wang L, Koch G. Secondary sexual characteristics in boys: estimates from the national health and nutrition examination survey III, 1988–1994. Arch Pediatr Adolesc Med. 2001;155:1022–1028. - PubMed
    1. Sun SS, Schubert CM, Chumlea WC, Roche AF, Kulin HE, et al. National estimates of the timing of sexual maturation and racial differences among US children. Pediatrics. 2002;110:911–919. - PubMed

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