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Jumping Impairs Visual Feedback Control of Body Position

机译：跳跃削弱身体位置的视觉反馈控制

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Purpose. The aim of this study was to evaluate the effects of maximal rebound jumping on sensorimotor tasks that required visual feedback control in positioning the body. Methods. A group of 14 university students (age 23.7 ± 2.6 y, height 178.6 ± 9.2 cm, and weight 70.6 ± 11.4 kg) had to hit a target that randomly appeared on one side of a screen by horizontally shifting their centre of mass (COM) in the appropriate direction prior to (as a baseline) and after six 60-second maximal jump exercises. Each response test consisted of 60 targets. The time, distance, and the velocity of the centre of pressure (COP) trajectory between the stimulus's appearance and its hit, by visually-guiding the COM movement on the screen, were registered by means of a FiTRO Sway Check system using a dynamometric platform. During the sets of jumps, the power of the concentric phase of take off was registered using a FiTRO Jumper recorder. Results. Results found that after each set of jumping (of around 110 jumps per set), mean response time significantly (p ≤ 0.05) increased from an initial value of 1616 ± 506 ms to 1825 ± 562 ms till the 4th set, with no further increase towards the 6th set. Similarly, the mean distance of COP covered during the response time increased significantly (p ≤ 0.05) from a pre-exercise value of 0.449 ± 0.298 m to 0.550 ± 0.295 m after the 4th set which then plateaued towards the 6th set. However, no significant changes in mean COP velocity were detected. Conclusion. Rebound jumping negatively affected the visual feedback control in positioning the body. However, after the proprioceptive functions deteriorated to a certain level, there was no further impairment on sensorimotor parameters.
机译：目的。这项研究的目的是评估最大反弹跳跃对感觉运动任务的影响，这些运动需要视觉反馈控制身体的位置。方法。一组14名大学生（年龄23.7±2.6岁，身高178.6±9.2厘米，体重70.6±11.4千克）必须命中目标，方法是水平移动质心（COM）随机出现在屏幕的一侧在（作为基线）之前和之后的六十秒内进行最大60秒的最大跳跃练习。每个反应测试包含60个目标。通过使用测力平台的FiTRO Sway Check系统，通过视觉引导屏幕上的COM运动，可以在视觉上引导屏幕上的COM运动，从而记录刺激物出现与撞击之间的时间，距离和压力中心（COP）轨迹的速度。 。在跳跃过程中，使用FiTRO Jumper记录仪记录了起飞同心相的力量。结果。结果发现，每组跳跃后（每组跳跃约110次），平均响应时间（p≤0.05）从初始值1616±506 ms增加到1825±562 ms，直到第4次。 sup>集，而对第6 集没有进一步增加。同样，在响应时间覆盖的COP的平均距离从执行前的0.449±0.298 m显着增加（p≤0.05）到第4次设置后达到平稳的0.550±0.295 m。朝向第6个 集。但是，没有发现平均COP速度有明显变化。结论。回弹跳对身体定位的视觉反馈控制产生负面影响。然而，在本体感受功能恶化到一定水平后，感觉运动参数不再受到损害。

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