Secular Trends of Age at Menarche from 1985 to 2010 among Chinese Urban and Rural Girls

Zhu, Hong; Sun, Hongpeng; Pan, Chen‐Wei; Xu, Yong

doi:10.13189/ujph.2016.040101

Cited by 1 publication

(2 citation statements)

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“…These results are comparable to the parameters of girls living in developed countries, where the age of onset of menarche is from 12 to 13 years [22]. The age of onset of menarche is directly proportional to height and inversely proportional to body mass index [28]. The relation between the onset of menarche and body weight was established in 1974 by American scientist Rosa Frisch, who studied the issue of infertility.…”

Section: Discussionsupporting

confidence: 66%

“…And starting from the age of 12, a rapid increase in this total body size begins. According to the research of some scientists, it is known that body weight in girls is undeniable for puberty [11,28]. In our opinion, the amount of body fat is especially important for the onset of menarche, because in girls the subcutaneous fat acts as a depot for the accumulation of female sex hormones, including estrogen, which affect puberty and puberty.…”

Section: Discussionmentioning

confidence: 99%

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Dynamics of anthropometric indicators in girls within the pubertal period of ontogenesis

Sarafyniuk

Khapitska

et al. 2021

Rep. of Morph.

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The harmony of the organism development in different periods of ontogenesis, and especially puberty, determines the future fate of women in both medical and social aspects. The aim of the research was to study the total and partial body sizes in girls of pubertal period of ontogenesis. We surveyed 128 schoolgirls of 5-8 grades. We evaluated the stages of development of secondary sexual characteristics by hair growth in the axilla and pubis, the development of the mammary glands and age of onset of the first menstruation. According to G.G. Avtandilov’s classification, all girls were divided into three groups – prepubertal (preceding the appearance of pubic hair), pubertal (puberty before menarche) and postpubertal period (fixed and completed pubertal maturation). The group of pubertal girls consisted of 106 schoolgirls, who were divided into groups according to calendar age: 13-year-old (n=29), 12-year-old (n=30), 11-year-old (n=24) and 10-year-old (n=23). Anthropometric survey was conducted according to the scheme of V.V. Bunak and contained the definition of total (length and body weight) and partial (longitudinal, transverse and anterior-posterior) dimensions. The analysis of the obtained results was performed in the license package Statistica 5.5 using non-parametric methods of evaluation of indicators. In our study, it was found that anthropometric indicators characterize the physical development, the level of its harmony and morphofunctional maturity of girls within the pubertal period of ontogenesis. We found a progressive age dynamics of total and partial body size in girls of this age period. The periods of the most intensive growth within the pubertal period of ontogenesis of total and partial sizes of a body are established. At the end of puberty there is the most intense age increase in body length: a rapid increase in body weight begins at the age of 12, the most intense processes of longitudinal growth of the torso and lower extremities in girls are observed from 11 years. Most of the transverse dimensions within the pubertal period of ontogenesis have a pronounced progressive age dynamic. Lower thoracic size, interspinous distance, and external conjugate did not differ statistically significantly between girls of different ages during puberty.

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Section: Discussionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 99%