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首页> 外文期刊>Journal of strength and conditioning research >Bilateral contact ground reaction forces and contact times during plyometric drop jumping.
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Bilateral contact ground reaction forces and contact times during plyometric drop jumping.

机译：测雨滴跳跃期间的双边接触地面反作用力和接触时间。

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Drop jumping (DJ) is used in training programs aimed to improve lower extremity explosive power. When performing double-leg drop jumps, it is important to provide an equal stimulus to both legs to ensure balanced development of the lower legs. The aim of this study was to bilaterally analyze the ground reactions forces and temporal components of drop jumping from 3 heights. Ten recreationally active male subjects completed 3 bounce-drop jumps from 3 starting heights (0.2, 0.4, and 0.6 m). Two linked force platforms were used to record left- and right-leg peak vertical force, time to peak force, average force, ground contact time, impulse and time differential. Between-height and between-leg comparisons for each variable were made using a multivariate analysis of variance with post hoc Wilcoxon tests (p < 0.05). Results indicated that force and time variables increased as drop jump height increased (p < 0.0001). Post hoc analyses showed that at 0.2- and 0.4-m bilateral differences were present in the time to peak force, average force, and impulse. No bilateral differences for any variables were shown at 0.6-m starting height. The contact time for all jumps was <0.26 seconds. At 0.2 m, only 63% of the subjects had a starting time differential of <0.01 seconds, rising to 96.3% at 0.6 m. The results indicated that 0.6 m is the suggested drop jump height to ensure that no bilateral differences in vertical forces and temporal components occur; however, shorter contact times were found at the lower heights.
机译：跳跳训练（DJ）用于旨在提高下肢爆炸力的训练计划中。当进行双腿跌倒跳跃时，对双腿提供相同的刺激以确保小腿的平衡发育非常重要。这项研究的目的是从三个高度双向分析地面反作用力和液滴跳跃的时间分量。十名具有娱乐活动能力的男性受试者从3个起始高度（0.2、0.4和0.6 m）完成了3次跳跳。使用两个链接的力平台记录左腿和右腿的峰值垂直力，达到峰值力的时间，平均力，地面接触时间，冲量和时差。使用事后Wilcoxon检验使用方差的多变量分析对每个变量的身高和腿间进行比较（p <0.05）。结果表明，力和时间变量随下落跳高的增加而增加（p <0.0001）。事后分析表明，在达到峰值力，平均力和脉冲的时间上，在0.2和0.4 m处存在双边差异。在起始高度0.6-m处，没有显示任何变量的双边差异。所有跳跃的接触时间均小于0.26秒。在0.2 m时，只有63％的受试者的开始时间差小于0.01秒，在0.6 m时上升到96.3％。结果表明0.6 m是建议的跌落跳跃高度，以确保在垂直力和时间分量上不会出现双边差异。然而，在较低的高度发现了较短的接触时间。

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