INTRODUCTION: In the area of female sport it is an interesting and exciting topic, to investigate the differences of the bodily development level of matured and unmatured girls. In our sample the differences of the body parameters, if any, in a group of young basketball player girls, from Sopron, in Hungary were studied. METHODS: Anthopometric parameters were taken (N=62, aged 9 to 16 years), somatotype components (Heath and Carter 1969), Conrad`s growth type (1963), Drinkwater and Ross (1980) body fractionation method and body fat content (Parizková 1971) were characterized by the maturational status. Menarcheal age was registered retrospectively. Basic statistics, Student t-test, linear correlation analysis were used to characterize and analyze the differences between the subgroups. Biological age was assessed by the morphological age (Mészáros and Mohácsi 1982). RESULTS: The average menarcheal age of the girls (n=18) was 12,33 (±0,98) years, lower than the Hungarian menarche median (12.79 years). All the girls were taller and heavier than the reference values. The less differences occured in the 11 and 12 year subgroups. The largest differences occured in body mass at the age of 13yrs, and in stature from 13yrs on, presumably as the result of the selection. When comparing the matured and non-matured girls some characteristic differences were found: matured girls were more endomorphic, and less ectomorphic than non-matured ones. They had higher BMI (20.63±2,19 vs.17,82±3,24), body fat content (23,11±3,80 vs. 19,79±5,04), and lower bone percentage values. There were no differences in the muscle contents, supposingly because of the high variation. CONCLUSION: It is important to understand the differences between matured and unmatured young athletes, especially because of the planning the workload and the evaluation of their performance.
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