The age of onset of pubertal development in healthy Thai boys in Khon Kaen, Thailand

Kiatsopit, Noppol; Panamonta, Ouyporn; Suesirisawat, Chatchai; Panamonta, Manat

doi:10.5372/1905-7415.0902.391

Cited by 4 publications

(2 citation statements)

References 13 publications

(20 reference statements)

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“…Our results suggest an even more pronounced anticipation of puberty in boys, and are in agreement with data from American children, in which the appearance of secondary sexual characteristics also occurred earlier (Herman-Giddens et al, 2012). In Thailand, there was no secular trend in genital development; however, adolescents appear to be reaching the PH2 stage slightly later than has been shown in earlier studies (Kiatsopit et al, 2015). In Denmark, the estimated average age of reaching the PH2 stage also appears to have increased between 1991 and 2006, although it has decreased in the PH4 and PH5 F I G U R E 3 Median ages (percentiles 25 and 75) for Tanner stages for boys and girls aged 9-14 years old according to type of school and year of study.…”

Section: Discussionsupporting

confidence: 92%

Assessment of the median ages at sexual maturation stages of Brazilian schoolchildren according to overweight status and type of school over a 5‐year period: 2007–2012/2013

Matsuo

Adami

Silva

et al. 2021

American J Hum Biol

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Objectives A secular trend of earlier puberty has been observed in girls, and, although more uncertain in boys, is associated with an increasing trend in the prevalence of overweight and obesity. We aimed to compare the median ages of sexual maturation stages in schoolchildren from a city in southern Brazil over a 5‐year period, according to weight status and type of school. Methods Two cross‐sectional studies were performed in 2007 and 2012/2013, including 2215 and 1614 schoolchildren, respectively. Body mass index z‐scores were calculated and categorized as either nonoverweight or overweight (including obesity). The type of school was categorized as either public or private. Sexual maturation was self‐assessed according to the Tanner stages. Mann–Whitney and Kruskal–Wallis tests were performed to compare the median ages of sexual maturation stages. Results The median age decreased for almost all stages over the 5‐year period in both sexes. In boys, the decrease ranged from 0.3 to 1.0 years (stages 2, 3, 4, and 5 for genitalia, and stages 2 and 4 for pubic hair), and from 0.3 to 0.7 years (stages 2, 3, and 4 for breast, and stages 3, 4, and 5 for pubic hair). In 2012, overweight students had lower median ages for most stages compared to those in 2007, especially in girls. Differences by type of school were balanced across years. Conclusions The median age of Tanner's stages after 5 years was reduced in both sexes. In overweight girls, the reduction was more pronounced. The results by type of school were inconsistent.

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Section: Discussionsupporting

confidence: 92%

Assessment of the median ages at sexual maturation stages of Brazilian schoolchildren according to overweight status and type of school over a 5‐year period: 2007–2012/2013

Matsuo

Adami

Silva

et al. 2021

American J Hum Biol

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“… Kiatsopit et al (2015) report that a14-yearold boys (in mean) presented G4-P4 pubertal staging. The results of the present study corroborate these findings as boys also presented G4-P4 staging at 14 years of age, indicating the swim training in which the study volunteers were involved did not affect pubertal development.…”

Section: Discussionmentioning

confidence: 98%

Influence of Biological Maturity on the Muscular Strength of Young Male and Female Swimmers

Costa

Murara

Vancini

et al. 2021

Journal of Human Kinetics

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The present study compared the evolution of strength and muscle mass in swimmers of both sexes across different chronological and biological ages. Seventy-six swimmers (55 males and 21 females) from 10 to 20 years of age underwent evaluations of sexual maturation using the developmental stage of the genitals (G1, G2, G3 G4 and G5) and pubic hair (P1, P2, P3, P4 and P5) (Tanner criteria), lean mass using the dual-energy X-ray absorptiometry method, and isokinetic strength of the knee extensor muscles. Boys did not present a significant difference in strength among G1, G2, and G3 (p > 0.05) nor between 10 and 13 years of age (p > 0.05), although significant differences in strength of the extensor (p = 0.038) muscles of the knee were found between G3 and G4 and between athletes of 10 and 14 years of age (extensor muscles, p = 0.033). Muscle mass was different between G3 and G4 (p = 0.003) and between 10 and 14 years of age (p = 0.020). The mean age of boys in the G4 pubertal stage was 13.7 ± 2.0 years, although from 12 to 16 years of age, boys are typically in the G4 stage. Girls showed no significant differences in strength nor muscle mass among the pubertal stages (p > 0.05). We conclude that by equating boys by chronological age, individuals with different pubertal development levels, muscle mass, and strength levels can be grouped. Therefore, the relationship between the level of pubertal deve-lopment and chronological age seems to be a useful strategy for grouping boys, while grouping girls by chronological age seems adequate for training and competition.

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Impact of risperidone on leptin and insulin in children and adolescents with autistic spectrum disorders

Srisawasdi

Vanwong

Hongkaew

et al. 2017

Clinical Biochemistry

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The age of onset of pubertal development in healthy Thai boys in Khon Kaen, Thailand

Cited by 4 publications

References 13 publications

Assessment of the median ages at sexual maturation stages of Brazilian schoolchildren according to overweight status and type of school over a 5‐year period: 2007–2012/2013

Assessment of the median ages at sexual maturation stages of Brazilian schoolchildren according to overweight status and type of school over a 5‐year period: 2007–2012/2013

Influence of Biological Maturity on the Muscular Strength of Young Male and Female Swimmers

Impact of risperidone on leptin and insulin in children and adolescents with autistic spectrum disorders

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