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Attenuation of the evoked responses with repeated exposure to proprioceptive disturbances is muscle specific.

机译:反复暴露于本体感受障碍中引起的诱发反应减弱是肌肉特异性的。

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In response to repetitive proprioceptive disturbances (vibration) applied to postural muscles, the evoked response has been shown to decrease in amplitude within the first few trials. The present experiment investigated whether this attenuation of the response to vibration stimulation (90Hz, 5s) was muscle specific or would be transferred to the antagonist muscles. Sixteen participants stood upright with eyes closed. One half of the participants practiced 15 tibialis vibrations followed by 15 calf vibrations (TIB-CALF order), while the other half practiced the opposite order (CALF-TIB order). Antero-posterior trunk displacements were measured at the level of C7 and centre of foot pressure (COP). EMG activity of the tibialis anterior (TA) and gastrocnemius lateralis (GL) was also measured. Results showed that evoked postural responses as well as EMG activity decreased with practice when vibration was applied to either calf or tibialis muscles. However, such attenuation of the response appeared muscle specific since it did not generalise when the same vibration stimulus was later applied onto the antagonist muscles.
机译:响应于对姿势肌肉施加的重复性本体感受障碍(振动),在前几次试验中,诱发的反应已显示出振幅降低。本实验研究了这种对振动刺激(90Hz,5s)的衰减是否是肌肉特异性的或是否会转移到拮抗肌上。 16位参与者直立,双眼紧闭。一半的参与者练习了15次胫骨振动,然后是15次小腿振动(TIB-CALF顺序),而另一半的参与者则进行了相反的顺序(CALF-TIB顺序)。在C7水平和足底压力(COP)处测量前后躯干位移。还测量了胫前肌(TA)和外侧腓肠肌(GL)的EMG活性。结果表明,当对小腿或胫骨肌肉施加振动时,诱发的姿势反应以及EMG活性随练习而降低。但是,这种响应的衰减似乎是肌肉特有的,因为在随后将相同的振动刺激施加到拮抗肌上时,这种响应没有普遍化。

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