المستخلص: |
The aim of the current study was to investigate the effect of short-term combined plyometric training and sprinting with change of direction on repeated change of direction and repeated sprint ability in soccer players under 19 years old. Twenty soccer players participated in this study. The subjects were randomly assigned to the experimental group (EG; n = 10, age: 17.6 ± 0.52 years) and control group (CG; n = 10, age: 17.5 ± 0.53 years). Pre- and post-intervention measures were repeated change of direction and repeated sprint ability tests. Data were analyzed using paired sample t-tests and independent sample t-tests (IBM SSPS 29.0). The statistical analysis revealed significant improvement within the experimental group in three RCOD measures: RCOD-TT (p =.002, d = 1.36); RCOD-FT (p =.006, d = 1.12); and RCOD-AT (p =.002, d = 1.36). Furthermore, RSA variable measures showed meaningful improvements with moderate effect size in RSA-TT (p =.013, d = 0.97), RSA-FT (p =.013, d = 0.97), and RSA-AT (p =.014, d = 0.96). Between-group analyses showed moderate performance improvements in the RCOD-TT (p =.022, d = 1.12), RCOD-AT (p =.022, d = 1.12), RSA-TT (p =.036, d = 1.01), and RSA-AT (p =.038, d = 1) in the experimental group more than in the control group. However, there was no significant difference in all RCOD and RSA measures within the control group. According to these results, short-term combined plyometric and change of direction training would be sufficient to enhance RCOD and RSA parameters (total time, fastest time, and average time), but not percentage decrement (fatigue index) and the RSA/RCOD index among U-19 soccer players.
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