Reduced effects of tendon vibration with increased task demand during active, cyclical ankle movements.
Reduced effects of tendon vibration with increased task demand during active, cyclical ankle movements.
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DOI：
10.1007/s00221-013-3739-2
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发表时间：
2014-01
影响因子：
2
通讯作者：
Dean, Jesse C.
中科院分区：
文献类型：
--
作者：
Floyd, Lisa M.;Holmes, Taylor C.;Dean, Jesse C.
肌腱振动可以改变本体感受反馈，这是人类可以用来产生准确运动的感觉信息的一个来源。然而，功能性运动期间肌腱振动的影响因任务而异。例如，踝关节肌腱振动在行走期间比站立姿势具有小得多的影响。本研究的目的是测试踝关节肌腱振动的影响是否是可预测的影响的机械需求的任务，量化的峰值速度。12名参与者进行对称的，周期性的踝关节跖屈/背屈运动，同时俯卧，踝关节运动不受约束。规定的运动周期（1 s，3s）和峰间振幅（10°，15°，20°）在试验中不同;较短的运动周期或较大的振幅增加了峰值速度。在一些试验中，振动持续并同时施加到右踝跖屈肌腱和背屈肌腱，而左踝肌腱从未振动。振动频率（40、80、120、160 Hz）在试验中变化。在没有振动的试验中，参与者准确地匹配了他们脚踝的运动。施加80 Hz的振动到右踝关节肌腱显著降低了右踝关节运动的幅度。然而，在机械要求更高（即更高的峰值速度）的运动中，振动的影响较小。较高的振动频率对运动精度的影响较大，这可能是由于振动幅度的平行增加。这些结果表明，踝关节肌腱振动的影响取决于正在执行的任务的机械需求，但不能明确地确定潜在的生理机制。
Tendon vibration can alter proprioceptive feedback, one source of sensory information which humans can use to produce accurate movements. However, the effects of tendon vibration during functional movement vary depending on the task. For example, ankle tendon vibration has considerably smaller effects during walking than standing posture. The purpose of this study was to test whether the effects of ankle tendon vibration are predictably influenced by the mechanical demands of a task, as quantified by peak velocity. Twelve participants performed symmetric, cyclical ankle plantarflexion/dorsiflexion movements while lying prone with their ankle motion unconstrained. The prescribed movement period (1s, 3s) and peak-to-peak amplitude (10°, 15°, 20°) were varied across trials; shorter movement periods or larger amplitudes increased the peak velocity. In some trials, vibration was continuously and simultaneously applied to the right ankle plantarflexor and dorsiflexor tendons, while the left ankle tendons were never vibrated. The vibration frequency (40, 80, 120, 160 Hz) was varied across trials. During trials without vibration, participants accurately matched the movement of their ankles. The application of 80 Hz vibration to the right ankle tendons significantly reduced the amplitude of right ankle movement. However, the effect of vibration was smaller during more mechanically demanding (i.e. higher peak velocity) movements. Higher vibration frequencies had larger effects on movement accuracy, possibly due to parallel increases in vibration amplitude. These results demonstrate that the effects of ankle tendon vibration are dependent on the mechanical demand of the task being performed, but cannot definitively identify the underlying physiological mechanism.
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