Does proprioception contribute to the sense of verticality?
Does proprioception contribute to the sense of verticality?
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DOI：
10.1007/s00221-007-1177-8
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发表时间：
2008-03-01
影响因子：
2
通讯作者：
Perennou, Dominic
中科院分区：
文献类型：
--
作者：
Barbieri, Guillaume;Gissot, Anne-Sophie;Perennou, Dominic
垂直的表示可以通过测量视觉，触觉或姿势垂直（PV）的感知来评估。内脏重力感受器和高尔基腱受体有助于PV的感知，而肌肉本体感受（Ia肌梭）的作用仍有待澄清。本研究的目的是分析肌肉本体感觉是否有助于垂直性的表征。我们推测适当的腱肌振动对本体感觉的调节可能会使PV倾斜。我们提出了两个实验来探索这个假设。PV首先在两种情况下，在俯仰平面测量12名健康受试者：基线和振动的跟腱在6分钟内，根据平衡介绍。根据每种条件下的6次测量值计算PV方向（平均值）和离散度（标准差）。跟腱振动引起PV系统性后倾（平均2.7 ° ± 0.8 °; P < 10（-3）），PV离散度无显著变化。一个明确的后效应被发现为PV方向的科目谁开始了实验的条件vibration on. The可能性，PV也可以调制的振动持续时间短得多（小于8秒的振动）进行了分析，在第二个实验中使用类似的一般程序，但在其他科目的简化实验平面。再次向后PV倾斜是由振动引起的，但幅度低于第一次实验中发现的幅度，并且没有后效应。由于身体几何形状没有改变，这两项研究意味着本体感觉有助于垂直的表示。总之，本研究为我们对垂直感的理解带来了新的见解，并有助于解释由振动引起的向后福尔斯。诱发的向后跌倒部分是由于直立姿势与垂直度的后倾参考对齐。
The representation of the vertical can be assessed by measuring the visual, tactile or perception of the postural vertical (PV). It is well accepted that visceral graviceptors and Golgi tendon receptors contribute to perception of the PV, whereas the role of muscular proprioception (Ia muscle spindles) remains to be clarified. The objective of this study was to analyze whether or not muscular proprioception contributes to the representation of verticality. We hypothesized that the modulation of proprioception by appropriate tendinomuscular vibration may tilt the PV. We present two experiments that explore this hypothesis. PV was firstly measured in the pitch plane in twelve healthy subjects in two conditions: baseline and vibration of both Achilles tendons during six minutes, according to a counterbalanced presentation. PV orientation (mean) and dispersion (standard deviation) were calculated on the six measurements per condition. Vibration of the Achilles tendons induced a systematic backward tilt of PV (2.7 degrees +/- 0.8 degrees on average; P < 10(-3)), and no significant changes regarding PV dispersion. A clear post-effect was found for PV orientation in subjects who started the experiment with the condition vibration on. The possibility that PV could also be modulated by a much shorter duration of vibration (less than 8 s of vibration) was analyzed in a second experiment using a similar general procedure but a simplified experimental plane in other subjects. Again a backward PV tilt was induced by the vibration, but with a magnitude lower than that found in the first experiment, and with no post-effect. Since body geometry was unchanged, these two studies mean that proprioception contributes to the representation of the vertical. In conclusion, this study brings new insights to our understanding of the sense of verticality and contributes to the interpretation of backward falls induced by vibration. The induced backward fall is partly due to alignment of the erect posture with a backward-tilted referential of verticality.