Crescimento pós-menarca em uma coorte de meninas brasileiras

Abstract

The purpose of this paper was to assess post-menarcheal growth in a cohort of Brazilian girls and correlate it with the age, stature and BMI at menarche. Records of the age, weight, and stature at menarche, and 5 years later, of 111 girls who attended the Adolescent Unit of the Child Institute-HC-Medical School of the University of São Paulo, were recovered. The median age at menarche was 12.67 years and the mean increase in height was 7.54 +/- 3.35 cm. The largest span of growth was observed in girls who reached menarche before 12.67 years (r= -0.46; p= 0.0001) and in the ones who had less stature at this moment (r= -0.44; p= 0.0001). The best correlation was observed in girls with stature between p25 and p75 of NCHS reference data (r= -0.72; p= 0.0001). Adolescents with greater BMI had earlier menarche (11.9 years). No correlation was found between BMI and post-menarcheal growth (r= 0). In this cohort, post-menarcheal growth was similar to other studies and correlations offer information to assess the potential of growth after menarche.

Equação preditora de idade óssea na iniciação esportiva através de variáveis antropométricas

“…Different studies in Brazil and the UUA with volleyball athletes associate late maturation with high performance athletes, even presenting positive correlations which associate the taller athletes and with high sports performance with a delayed maturation process, as in the studies by Borjikian et al 17 , which evidence that the women athletes of the Brazilian adult team (high performance) presented significantly late menarche age (13.0), if compared with the ones from the youth Brazilian team (10.5) or even with the adult athletes from clubs in Brazil (11.1). Such study also mentions that the taller female athletes are also the ones with late maturation, agreeing with the studies by Castilho et al 18 and de Malina et al 8 The literature reveals that when this variable is observed in the selection process of athletes, it is important to include criteria such as maturation, avoiding hence errors in the sports development process, since the athletes who present taller stature from an early age may be individuals with early maturation and present higher technical control 16,17 .…”

Body Mass Index and Height Growth Curves are influenced by Sexual Maturation Status in Brazil: Cross-Sectional Study

“…Although an increased BMI may cause early maturation, [2,39] it is important to note that sexual maturation and increased BMI are phenomena that occur in parallel, it is difficult to establish whether increased BMI is a consequence or an early determinant of precocious puberty.…”

“…[1] However, assessing nutritional status using only BMI and height cannot accurately identify changes in body composition in this population, as both tend to increase significantly in each sexual maturation stage. [2,3,4] Although growth and sexual maturation occur simultaneously and both promote changes in shape, size and body composition, growth involves quantitative biological aspects, while sexual maturation is a biological phenomenon which takes place in puberty and is related to the maturation of sex organs and their functions. [5,6] In addition, changes in body composition during puberty occur in different ways for males and females, while boys have an increase in fat-free mass, girls have an increase in fat mass.…”

Influência da restrição de crescimento intra-uterino na idade da menarca: estudo da coorte de nascidos vivos de Ribeirão Preto de 1978/9

“…,57 (0,38-0,84) 0,57 (0,39-0,83) 0,57 (0,39-0,83) 2 0,60 (0,42-0,88) 0,61 (0,42-0,87) 0,60 (0,42-0,86) 3 0,60 (0,40-0,90) 0,61 (0,41-0,91) 0,61 (0,41-0,89) A partir de 4 0,43 (0,27-0,67) 0,43 (0,28-0,67) 0,43 (0,28-0,66) Número de irmãos Nenhum 1,00* 1,00* 1,00* 1 0,67 (0,36-1,24) 0,67 (0,37-1,23) 0,66 (0,36-1,20) 2 0,80 (0,45-1,43) 0,80 (0,45-1,41) 0,78 (0,44-1,38) 3 0,86 (0,46-1,60) 0,86 (0,47-1,59) 0,84 (0,46-1,55) A partir de 4 0,55 (0,28-1,09) 0,55 (0,28-1,08) 0,54 (0,28-1,05) Situação conjugal Sem parceiro 1,00 1,00 1,00 Com parceiro 0,85 (0,48-1,51) 0,86 (0,49-1,51) 0,86 (0,49-1,51) Comprimento ao nascer <47cm 1,00 1,00 1,00 47cm e <49cm 0,71 (0,45-1,12) 0,72 (0,46-1,13) 0,70 (0,44-1,11) 49cm e < 51cm 0,75 (0,48-1,16) 0,75 (0,49-1,17) 0,72 (0,46-1,13) Embora a média da idade da menarca tenha sido semelhante à relatada em estudos nacionais (LAGO et. al, 2007;GIGANTE;MINTEN, 2008;TAVARES;HAEFFNER;BARBIERI, 2000;CASTILHO;SAITO;BARROS FILHO, 2005) e internacionais (THOMAS et. al, 2008), a associação entre idade da menarca e as medidas de restrição de crescimento foi negativa.…”