Improvement of motor abilities in pubertal girls

Background. Purpose of the study was to test the hypothesis that in the cou rse of sexual maturation possibilities for accelerated development of motor abilities are triggered in girls. Methods. A cross-sectional study was conducted on 77 healthy 11- to 14-year -old girls, grouped according to Tanner's 5-stage scale of sexual maturatio n. Motor abilities were assessed with the aid of 20 m dash, 4x9 m shuttle r un, standing long jump, squats in 30 sec, sit ups in 30 sec, trunk forward flexion, Cooper 12-min running test, and Harvard step-test. Results. Performance in the shuttle run, standing long jump and trunk forwa rd flexion improved in correlation with sexual maturation stage. When conse cutive maturation groups were compared, in standing long jump and trunk for ward flexion significant differences were found between sexual maturation s tages II and III, in shuttle run between stages I and II. The significant m ain effect of sexual maturation was confirmed with the aid of MANOVA. 23 % of variance In the results of trunk forward flexion, 17% in standing long j ump, and 10% in shuttle run were attributable to maturation differences. Fo r the same three motor tasks 4%, 8%,and 15%,were respectively attributed to age differences. Differences between maturation groups disappeared when th e results of shuttle run and standing long jump were adjusted with the aid of ANCOVA for age or height as the covariate, but persisted after results w ere controlled for body mass. Conclusions. The results support the tested hypothesis. Critical for improv ement of agility is reaching maturation stage II, and for increase of leg m uscle explosive strength and trunk flexibility, reaching stage III.