engleski

The Effects of 3-Month Skill-Based and Plyometric Conditioning on Fitness Parameters in Junior Female Volleyball Players

Purpose: This study compared the effects of skill-based and plyometric conditioning (both performed in addition to regular volleyball training twice a week for 12 wk) on fitness parameters in female junior volleyball players. Methods: The participants [n = 47 ; age: 16.6 (0.6) y ; mass: 59.4 (8.1) kg ; height: 175.1 (3.0) cm] were randomized into a plyometric (n = 13), a skill-based (n = 17), and a control (n = 17) groups. The variables included body height, body mass, calf girth, calf skinfold, corrected calf girth, counter-movement jump, 20-msprint, medicine ball toss, and sit-and- reach test. Results: Two-way analysis of variance (time x group) effects for time were significant (P < .05) for all variables except body mass. Significant group x time interactions were observed for calf skinfold [eta(2) = .14 ; medium effect size (ES)], 20-m sprint (eta(2 )= .09 ; small ES), counter- movement jump (eta(2 )= .29 ; large ES), medicine ball (eta(2 )= .58 ; large ES), with greater gains (reduction of skinfold) for plyometric group, and sit-and-reach (eta(2 )= .35 ; large ES), with greater gains in plyometric and skill-based groups. The magnitude-based inference indicated positive changes in 1) medicine ball toss and counter- movement jump for all groups ; 2) sit-and-reach for the plyometric and skill-based groups ; and 3) 20-m sprint, calf girth, calf skinfold, and corrected calf girth for plyometric group only. Conclusion: Selected variables can be improved by adding 2 plyometric training sessions throughout the period of 12 weeks. Additional skill-based conditioning did not contribute to improvement in the studied variables compared with regular volleyball training.

physical performance ; plyometrics ; testing

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