title: Age at menarche in relation to anthropometric characteristics, competition level and boat category in elite junior rowers.
abstract: BACKGROUND
  Within the context of the effects of training for sports on growth and maturation, there is very little menarcheal data for elite rowing athletes. Knowledge of the relationship of the maturational status with training level, different boat categories, and somatic features of the athletes will clarify the assumed impact of rowing training on the growth and maturational process of youngsters.
  
  
  OBJECTIVE
  The aim of this study was to determine the age at menarche in world top junior rowing athletes and to investigate its relationship with anthropometric characteristics, and competition level, rowing style and boat category.
  
  
  METHODS
  The sample consisted of 212 female junior rowers, with a mean chronological age of 17.6 +/- 0.8 years, all participants at the 1997 FISA World Junior Rowing Championships. Anthropometric dimensions, somatotype and body composition characteristics were measured, and age at menarche and training data were retrospectively obtained by questionnaires.
  
  
  RESULTS
  Results revealed that the mean age at menarche of the total group of rowers was 12.8 +/- 1.2 years and did not differ from a non-athletic reference population. Rowers who started their rowing training before menarche (n = 78) showed a significant (p </= 0.01) later age at menarche compared with rowers who started their training after menarche (n = 134), with mean ages of 13.4 and 12.4 years, respectively. No significant relationship between the age at menarche and physical and body composition characteristics could be demonstrated, with r varying between -0.11 and 0.11. Furthermore, no significant differences in ages at menarche between competition levels (finalists versus non-finalists/medallists versus non-medallists) and between the different boat categories could be observed.
  
  
  CONCLUSIONS
  Based on the results of this study, there is no direct evidence to state that intensive rowing training has a negative influence on the maturation status of junior female athletes.
authors.affiliation: Department of Sport and Movement Sciences, KU Leuven, Leuven, Belgium. albrecht.claessens@flok.kuleuven.ac.be
authors.forename: A L
authors.initials: AL
authors.lastname: Claessens
authors.forename: J
authors.initials: J
authors.lastname: Bourgois
authors.forename: G
authors.initials: G
authors.lastname: Beunen
authors.forename: R
authors.initials: R
authors.lastname: Philippaerts
authors.forename: M
authors.initials: M
authors.lastname: Thomis
authors.forename: J
authors.initials: J
authors.lastname: Lefevre
authors.forename: R J E
authors.initials: RJ
authors.lastname: Loos
authors.forename: J
authors.initials: J
authors.lastname: Vrijens
mesh_terms: D000293:Adolescent; D001823:Body Composition / Q000502:physiology*; D001824:Body Constitution / Q000502:physiology*; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008572:Menarche / Q000502:physiology*; D010806:Physical Education and Training; D012189:Retrospective Studies; D013177:Sports / Q000502:physiology*; D011795:Surveys and Questionnaires