Talis V L, Solopova I A, Kazennikov O V
Institute of Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia.
Neurosci Behav Physiol. 2010 Jan;40(1):21-8. doi: 10.1007/s11055-009-9231-6.
Transcranial magnetic stimulation was used to study changes in corticospinal excitability during vibration of the flexor and extensor muscles of the wrist in healthy humans. The ratios of muscle stimulation responses to activity levels in these muscles on contraction associated with vibration (the tonic vibratory reflex, TVR) and after vibration of antagonist muscles in isometric conditions (the antagonist vibratory reflex, AVR) were analyzed. The normalized muscle response in the wrist flexors was found to increase by 66% compared with threshold values in the direct vibratory response (TVR), by 75% in the relayed vibratory response (AVR), and by 18% on voluntary contraction. However, increases in the motor response in vibratory responses as compared with those on voluntary contraction did not reach significance, which contrasted with the responses in the forearm flexors. These results are discussed from the point of view that the motor cortex plays different roles in vibratory responses in the distal and proximal muscles.
采用经颅磁刺激技术研究健康人在手腕屈肌和伸肌振动过程中皮质脊髓兴奋性的变化。分析了与振动相关的收缩过程中（紧张性振动反射，TVR）以及等长条件下拮抗肌振动后（拮抗肌振动反射，AVR）这些肌肉的刺激反应与活动水平的比率。结果发现，与直接振动反应（TVR）的阈值相比，手腕屈肌的标准化肌肉反应增加了66%，在中继振动反应（AVR）中增加了75%，在自主收缩时增加了18%。然而，与自主收缩相比，振动反应中的运动反应增加未达到显著水平，这与前臂屈肌的反应形成对比。从运动皮层在远端和近端肌肉的振动反应中发挥不同作用的角度对这些结果进行了讨论。
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