Purpose: To examine the effect of a 10-week plyometric training (PT) on the kinematic and kinetic properties of prepubescent girls during squat jump, countermovement jump, and drop jumps. Methods: Twenty-four untrained girls (aged 9–11 y) were assigned to a training group (TG) and a control group. The TG followed twice a week PT for 10 weeks. Squat jump, countermovement jump, and drop jumps performed from heights of 20, 35, and 50 cm were tested before and after PT. Jump height, kinematic, and kinetic parameters were evaluated using a motion analysis system and a force plate. Results: Jumping height in all jump types increased significantly after PT for the TG (P < .001). After training, the TG presented increased power (P < .001) and knee angular velocity (P < .001), higher knee flexion at the deepest point during the braking phase (P < .001), longer contact time (P < .001), and unchanged stiffness and reaction strength index (P > .05). No differences were observed in the control group (P > .05). Conclusion: These findings indicate that a 10-week PT positively affected jumping performance in prepubescent girls who improved their drop jump performance after training not by adopting a stiff/bouncing jumping style of short contact time and increased stiffness, but a compliant/absorbing style of prolonged contact time.

目的：研究为期10周的体能训练（PT）对青春期女孩在下蹲跳，反动作跳和下降跳期间的运动学和动力学特性的影响。方法：将24名未经训练的女孩（9-11岁）分配到训练组（TG）和对照组。TG每周两次PT，持续10周。在PT之前和之后，分别测试了从20、35和50 cm的高度进行的下蹲跳，反跳和落跳。使用运动分析系统和测力板评估跳跃高度，运动学和动力学参数。结果： TG后PT（ P <.001）。训练后，TG表现出增加的力量（P  <.001）和膝盖角速度（P  <.001），在制动阶段的最深点膝关节屈曲更高（P  <.001），接触时间更长（P  <。 001），并且刚度和反作用强度指数保持不变（P  > .05）。对照组中未观察到差异（P  > 0.05）。结论： 这些发现表明，为期10周的PT积极影响了青春期前女孩的跳跃性能，这些女孩在训练后通过不采用短接触时间和增加刚度的僵硬/弹跳跳跃方式，而是通过长期接触的顺从/吸收方式来提高训练后的下降跳跃性能。时间。