title: Effects of two different resistance-training programs on mean tennis-serve velocity in adolescents.
abstract: The purpose of the current study was to evaluate the transferability of 2 different resistance training protocols on service velocity and its precision consistency in junior tennis players. Thirty-six male athletes (15.03 ± 1.64 years) were randomly assigned to a machine-based resistance-training group (RG, n = 12), a plyometric training group (PG, n = 12), and a control group (CG, n = 12). For a period of 8 weeks, both intervention groups resistance trained 2 days per week in addition to their regular tennis training, whereas the CG had no extra training. Mean service velocity over 20 maximum-velocity serves increased significantly more in PG (3.78%; p < .05) when compared with CG, whereas no such changes could be found in the RG (1.18%; p > .05). Service precision did not change from pre- to posttest in all three groups (p > .05). Only the plyometric training program tested, improved mean service velocity over 20 maximum-velocity serves in junior tennis players but did not affect service precision.
authors.affiliation: Institute of Training Science and Sport Informatics, German Sport University Cologne, Cologne, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Behringer
authors.forename: Sebastian
authors.initials: S
authors.lastname: Neuerburg
authors.forename: Maria
authors.initials: M
authors.lastname: Matthews
authors.forename: Joachim
authors.initials: J
authors.lastname: Mester
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D000886:Anthropometry; D054874:Athletic Performance; D006801:Humans; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D059385:Plyometric Exercise / Q000379:methods*; D012016:Reference Values; D055070:Resistance Training / Q000379:methods*; D013647:Task Performance and Analysis; D013715:Tennis / Q000193:education / Q000502:physiology*; D013997:Time Factors