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<p>The aim of this study was to analyze the athletic development and isokinetic strength ratios of junior volleyball players during their first year at a&#xa0;national training camp. Fifty-one male volleyball players were investigated before and after their first year of training at the national training center. The tests consisted of linear sprint and vertical jump performance as well as isokinetic leg, trunk, and shoulder strength. Furthermore, isokinetic bilateral strength differences and antagonist ratios were calculated. The results of a&#xa0;repeated-measures analysis of variance (ANOVA) showed significant increases in isokinetic leg (<i>p</i> &lt; 0.05 to <i>p</i> &lt; 0.01) and trunk (<i>p</i> &lt; 0.01) extension strength only. Jump and sprint performance as well as isokinetic trunk flexion and shoulder strength did not show significant changes (<i>p</i> &gt; 0.05). The isokinetic strength ratios did not reveal significant adaptions (<i>p</i> &gt; 0.05) but displayed a&#xa0;high level of individuality. In conclusion, the results suggest either a&#xa0;need for refinement in program design and implementation or a&#xa0;questionable relevance of isokinetic strength testing for volleyball performance. Furthermore, the relevance of isokinetic strength ratios for injury prevention has to be further investigated.</p>

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Athletic development and isokinetic strength ratios of junior volleyball players during their first year at a national training center

  • 期刊论文

  • 发表日期：

    2025年2月19日

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  • Sebastian Puschkasch-Möck

摘要

The aim of this study was to analyze the athletic development and isokinetic strength ratios of junior volleyball players during their first year at a national training camp. Fifty-one male volleyball players were investigated before and after their first year of training at the national training center. The tests consisted of linear sprint and vertical jump performance as well as isokinetic leg, trunk, and shoulder strength. Furthermore, isokinetic bilateral strength differences and antagonist ratios were calculated. The results of a repeated-measures analysis of variance (ANOVA) showed significant increases in isokinetic leg (p < 0.05 to p < 0.01) and trunk (p < 0.01) extension strength only. Jump and sprint performance as well as isokinetic trunk flexion and shoulder strength did not show significant changes (p > 0.05). The isokinetic strength ratios did not reveal significant adaptions (p > 0.05) but displayed a high level of individuality. In conclusion, the results suggest either a need for refinement in program design and implementation or a questionable relevance of isokinetic strength testing for volleyball performance. Furthermore, the relevance of isokinetic strength ratios for injury prevention has to be further investigated.