title: The Effects of 17 Weeks of Ballet Training on the Autonomic Modulation, Hormonal and General Biochemical Profile of Female Adolescents.
abstract: This study aimed to examine the alterations in physiological and biochemical markers, after 17 weeks of ballet training in high level ballet dancers. Twenty four female ballet dancers from 12 to 15 years old took part in the study. The study followed 17 weeks of ballet training and analyzed changes in body composition, the autonomic nervous system and biochemical variables before and after (post) training. The internal training load was obtained using the session rating of perceived exertion (session-RPE) method, calculated as the mean weekly session-RPE, monotony and strain. After 17 weeks of training there were significant increases in body mass, height, lean body mass, total protein, urea, hemoglobin concentration, testosterone and thyroxine. During this period, decreases in relative body fat, uric acid, red blood cells, C-reactive protein, and ferritin were also found. After the training period, the autonomic modulation demonstrated significant positive alterations, such as increases in parasympathetic related indices. Based on the results obtained we concluded that ballet training led to improvements in body composition and autonomic modulation. In general hematological and biochemical variables demonstrated that the training did not have adverse effects on the health state of the adolescents.
authors.affiliation: Departamento de Educação Física, Universidade Estadual do Norte do Paraná- (UENP), Jacarezinho, Paraná, Brasil. ; Grupo de Estudos das Adaptações Fisiológicas ao Treinamento- GEAFIT, Londrina, Brasil.
authors.forename: Carla Cristiane
authors.initials: CC
authors.lastname: da Silva
authors.affiliation: Departmento de Pediatria, Curso de Medicina do Adolescente, Programa de Pós-Graduação em Ginecologia, Obstetrícia e Mastologia, Faculdade de Medicina de Botucatu, Universidade do Estado de São Paulo (UNESP), São Paulo, Brasil.
authors.forename: Tamara Beres Lederer
authors.initials: TB
authors.lastname: Goldberg
authors.affiliation: Grupo de Estudos das Adaptações Fisiológicas ao Treinamento- GEAFIT, Londrina, Brasil.
authors.forename: Lúcio Flávio
authors.initials: LF
authors.lastname: Soares-Caldeira
authors.affiliation: Grupo de Estudos das Adaptações Fisiológicas ao Treinamento- GEAFIT, Londrina, Brasil.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Dos Santos Oliveira
authors.affiliation: Departamento de Histologia, Universidade Estadual de Londrina, Brasil.
authors.forename: Solange
authors.initials: S
authors.lastname: de Paula Ramos
authors.affiliation: Grupo de Estudos das Adaptações Fisiológicas ao Treinamento- GEAFIT, Londrina, Brasil.
authors.forename: Fábio Yuzo
authors.initials: FY
authors.lastname: Nakamura
keywords: autonomic nervous system; ballet training; body composition; youth dancers