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Abstract：
This study aimed to examine inter-limb jump asymmetries and their association with sport-specific performance in young swimmers. Thirty-eight (male, n = 19; female, n = 19) regional/national level young swimmers (age: 12.3 ± 1.2 years; height: 159.6 ± 8.2 cm; body mass: 52.5 ± 9.2 kg) participated in this study. Inter-limb asymmetries were assessed for single-leg countermovement jump (SLCMJ) and single-leg standing long jump (SLSLJ). Sport-specific performance was evaluated using front crawl (i.e., 50 m and 25 m) and front crawl kick (i.e., 50 m and 25 m). The kappa coefficient revealed a \"slight\" level of agreement (Κ = 0.156, 0.184, and 0.197 for female, male, and all, respectively) between the direction of asymmetry for SLCMJ and SLSLJ, indicating that asymmetries rarely favored the same limb during both tests. A paired sample t-test showed a significant difference (p = 0.025) between asymmetry scores obtained in SLCMJ and SLSLJ. No significant difference was found in asymmetry scores between males and females (p = 0.099 to 0.977). Additionally, no association between asymmetry scores and sport-specific performance was observed (p > 0.05). Our findings highlight the independent nature of inter-limb asymmetries derived from SLCMJ and SLSLJ among young male and female swimmers. Further, our results suggest no association between jumping asymmetries and sport-specific performance.
摘要：
这项研究旨在研究年轻游泳者的肢体间跳跃不对称性及其与运动特定表现的关系。三十八（男性，n=19；女性，n=19）区域/国家一级的年轻游泳者（年龄：12.3±1.2岁；身高：159.6±8.2cm；体重：52.5±9.2kg）参加了这项研究。评估了单腿反运动跳跃（SLCMJ）和单腿立定跳远（SLSLJ）的肢体间不对称性。特定于运动的性能是使用前爬行进行评估的(即，50米和25米)和前爬行踢(即，50m和25m）。卡帕系数显示出“轻微”的一致性水平(K=0.156、0.184和0.197，男性,和所有,分别)在SLCMJ和SLSLJ的不对称方向之间，这表明在两次测试中，不对称性很少有利于同一肢体。配对样本t检验显示在SLCMJ和SLSLJ中获得的不对称评分之间存在显著差异(p=0.025)。男性和女性之间的不对称评分没有显着差异（p=0.099至0.977）。此外,未观察到不对称评分与运动特异性表现之间的关联(p>0.05).我们的发现强调了年轻男女游泳者中SLCMJ和SLSLJ引起的肢体间不对称性的独立性。Further,我们的结果表明,跳跃不对称和运动特异性表现之间没有关联.
