Kasai Tatsuya, Yahagi Susumu, Shimura Kuniyoshi
Division of Sports and Health Sciences, Graduate School for International Development and Cooperation, Hiroshima University, 1-5-1 Kagamiyama, 739-8529, Higashihiroshima, Japan.
Gait Posture. 2002 Feb;15(1):94-100. doi: 10.1016/s0966-6362(01)00177-1.
We investigated the contribution of sensory signals arising from muscle proprioceptive receptors to anticipatory postural adjustments (APAs). During vibration applied to ankle (tibialis anterior; TA, soleus; Sol) or neck muscles, subjects generally describe having illusory sensations of whole-body movement, namely, whole-body movement in a backward and forward direction induced by vibration of the Sol or TA, respectively, and the front or back surface of the neck muscles, respectively. Preceding electromyographic (EMG) activity of the ipsilateral biceps femoris (BFi) muscle induced by rapid voluntary arm movement and the typical phenomenon of APA were changed dependent on these illusory whole-body movements, with preceding EMG activities of BFi appearing earlier in vibration applied to TA and later in vibration applied to Sol muscle. In vibration applied to the back surface of neck muscle, preceding EMG activities of BFi appeared earlier, as with vibration applied to TA. On the contrary, in vibration applied to the front surface of neck muscles, preceding EMG activities of BFi appeared later, as with vibration applied to Sol. Based on these results, we discuss changes in the central processing of proprioceptive signals used for coding of the spatial orientation of the body and its contribution to postural stabilization.
我们研究了来自肌肉本体感受器的感觉信号对预期姿势调整（APA）的作用。在对踝部（胫前肌；TA，比目鱼肌；Sol）或颈部肌肉施加振动时，受试者通常描述有全身运动的虚幻感觉，即分别由Sol或TA的振动以及颈部肌肉的后表面或前表面的振动分别引起的全身前后方向的运动。快速随意手臂运动诱发的同侧股二头肌（BFi）肌肉的肌电图（EMG）活动以及APA的典型现象会根据这些虚幻的全身运动而改变，BFi的前期EMG活动在对TA施加振动时出现得更早，而在对Sol肌肉施加振动时出现得更晚。在对颈部肌肉后表面施加振动时，BFi的前期EMG活动出现得更早，与对TA施加振动时一样。相反，在对颈部肌肉前表面施加振动时，BFi的前期EMG活动出现得更晚，与对Sol施加振动时一样。基于这些结果，我们讨论了用于编码身体空间方位的本体感受信号的中枢处理变化及其对姿势稳定的作用。
