Institute of Sport and Sport Science, University of Freiburg, Freiburg, Germany.
Scand J Med Sci Sports. 2013 Jun;23(3):331-9. doi: 10.1111/j.1600-0838.2011.01388.x.
The effect of whole body vibration (WBV) on reflex responses is controversially discussed in the literature. In this study, three different modalities of reflex activation with increased motor complexity have been selected to clarify the effects of acute WBV on reflex activation: (1) the electrically evoked H-reflex, (2) the mechanically elicited stretch reflex, and (3) the short-latency response (SLR) during hopping. WBV-induced changes of the H-reflex, the stretch reflex, and the SLR during hopping were recorded in the soleus and gastrocnemius muscles and were analyzed before, during (only the H-reflex), immediately after, 5 min and 10 min after WBV. The main findings were that (1) the H-reflexes were significantly reduced during and at least up to 5 min after WBV, (2) the stretch reflex amplitudes were also significantly reduced immediately after WBV but recovered to their initial amplitudes within 5 min, and (3) the SLR during hopping showed no vibration-induced modulation. With regard to the modalities with low motor complexities, the decreased H- and stretch reflex responses are assumed to point toward a reduced Ia afferent transmission during and after WBV. However, it is assumed that during hopping, the suppression of reflex sensitivity is compensated by facilitatory mechanisms in this complex motor task.
全身振动（WBV）对反射反应的影响在文献中存在争议。在这项研究中，选择了三种具有增加运动复杂性的不同反射激活模式，以阐明急性 WBV 对反射激活的影响：（1）电诱发 H 反射，（2）机械诱发伸展反射，（3）跳跃时的短潜伏期反应（SLR）。在跟腱和小腿三头肌中记录了 WBV 引起的 H 反射、伸展反射和跳跃时的 SLR 的变化，并在 WBV 之前、期间（仅 H 反射）、之后立即、5 分钟和 10 分钟进行了分析。主要发现是：（1）H 反射在 WBV 期间和至少在 WBV 后 5 分钟内显著降低，（2）伸展反射幅度也在 WBV 后立即显著降低，但在 5 分钟内恢复到初始幅度，（3）跳跃时的 SLR 没有显示出振动诱导的调制。对于运动复杂性较低的模式，H 反射和伸展反射反应的降低被认为指向 WBV 期间和之后 Ia 传入传输的减少。然而，据推测，在这个复杂的运动任务中，跳跃时反射敏感性的抑制被促进机制所补偿。
