This study aimed to examine young swimmers' behavioral flexibility when facing different task constraints, such as swimming speed and stroke frequency. Eighteen (five boys and 13 girls) 13- to 15-year-old swimmers performed a 15 × 50-m front crawl with five trials, at 100%, 90%, and 70% each of their 50 m maximal swimming speed and randomly at 90%, 95%, 100%, 105%, and 110% of their preferred stroke frequency. Seven aerial and six underwater cameras were used to assess kinematics (one cycle), with upper-limb coordination computed through a continuous relative phase and index of coordination. A cluster analysis identified six patterns of coordination used by swimmers when facing various speed and stroke frequency constraints. The patterns' nature and the way the swimmers shifted between them are more important than getting the highest number of patterns (range of repertoire), that is, a change in the motor pattern in order to adapt correctly is more important than being able to execute a great number of patterns.

中文翻译：

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年轻游泳运动员的任务限制和协调灵活性。

本研究旨在检查年轻游泳运动员在面临不同任务限制（例如游泳速度和划水频率）时的行为灵活性。18 名（5 名男孩和 13 名女孩）13 至 15 岁的游泳运动员进行了 5 次 15 × 50 米自由泳试验，分别以 50 m 最大游泳速度的 100%、90% 和 70% 进行，并随机进行其首选冲程频率的 90%、95%、100%、105% 和 110%。使用七个空中摄像机和六个水下摄像机来评估运动学（一个周期），并通过连续的相对相位和协调指数计算上肢协调性。聚类分析确定了游泳运动员在面临各种速度和划水频率限制时使用的六种协调模式。模式的性质以及游泳者在模式之间转换的方式比获得最多数量的模式（曲目范围）更重要，也就是说，为了正确适应而改变运动模式比能够执行更重要大量的图案。