Physiological tremor of the upper limb segments
Physiological tremor of the upper limb segments
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DOI：
10.1007/s004210100476
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发表时间：
2001-08-01
影响因子：
3
通讯作者：
Sakamoto, K
中科院分区：
文献类型：
--
作者：
Takanokura, M;Sakamoto, K
利用加速度传感器测量了人体上肢四个不同部位（手指、手、前臂和上肢）在握持姿势时生理性震颤产生的加速度信号，并对其进行了功率谱分析。在功率谱中出现两个显著的峰值，表明在四个不同的肢体节段的震颤是由两个频率分量。在8-12 Hz处的一个峰的频率在不同肢体段之间没有变化，而另一个峰的频率随着肢体段质量的增加而降低。建立了一个具有两条反射通路的四肢节段震颤模型。该模型包括两个反射通路，脊髓通路和脊髓上通路。模型预测的震颤频率和振幅的理论值与实验结果吻合较好。模型的分析表明，震颤的两个频率分量之一是脊髓起源，并取决于肢体节段的质量，第二个是脊髓上起源，对应于8-12 Hz的频率。在正常受试者中，震颤可以用于评估由仅涉及肢体节段的一部分的长时间工作产生的神经肌肉功能的变化（例如，打字）。它也可用于评估患有神经系统疾病如肌营养不良症和帕金森病的患者的神经肌肉功能。
The acceleration signal produced by physiological tremor from four different upper limb segments (the finger, hand, forearm and upper limb) was measured by an acceleration sensor during holding posture and was analyzed by power spectrum analysis. Two prominent peaks appeared in the power spectrum, suggesting that the tremor in the four different limb segments was composed of two frequency components. The frequency of one peak at 8-12 Hz did not change between the different limb segments, while the frequency of the other peak decreased with the increase in the mass of the limb segment. A model with two reflex pathways was developed for the tremor in the four limb segments. The model includes two reflex pathways, a spinal pathway and a supraspinal pathway. The theoretical values of the frequency and the amplitude of the tremor predicted by the model were in good agreement with the experimental results. Analysis of the model revealed that one of the two frequency components of the tremor was of spinal origin and was dependent upon the mass of the limb segment, and the second was of supraspinal origin, corresponding to the frequency at 8-12 Hz. In the normal subject, it is possible that the tremor could be used to evaluate the change in neuromuscular function produced by prolonged work involving just part of a limb segments (e.g., typing). It may also be used to evaluate the neuromuscular function of patients suffering from neurological diseases such as muscular dystrophy and Parkinson's disease.