Abstract

Purpose

To determine a stimulus rate that is not influenced by homosynaptic post-activation depression for H-reflex studies in patients with chronic spasticity.

Materials and methods

A cohort of 15 chronic stroke patients with soleus spasticity who received inpatient treatment at our rehabilitation centre participated in this study. The effect of stimulus frequency related depression on H-reflex size was tested using four different stimulus rates (0.1, 0.2, 0.3 and 1 Hz). The affected sides stibial nerve was stimulated by a bipolar electrode. The H-reflex was recorded from the affected sideed sidee sidehe affected smine stimulus frequency related depression of H-reflex size, amplitude of the first H-reflex response (H₁) was used as control and amplitude of the second H-reflex response (H₂) as test.

Results

H₂ amplitude for frequency of 1 Hz, 0.3 Hz, 0.2 Hz and 0.1 Hz were 74.3, 84.1, 85.5 and 92.7% of H₁, respectively. Depression of H₂ amplitude was statistically significant for 1 Hz, 0.3 Hz and 0.2 Hz (p < 0.001, p = 0.002, p = 0.024, respectively).

Conclusions

Higher frequency stimulation of Ia afferents than 0.1 Hz induced a stimulus frequency-related depression of H-reflex size in patients with chronic spasticity. The optimal stimulus rate for H-reflex was found to be 0.1 Hz.

中文翻译：

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在慢性中风中不受同突触激活后抑制影响的刺激率。

摘要

目的

确定不受同突触激活后抑制影响的刺激速率，用于慢性痉挛患者的 H 反射研究。

材料和方法

一组 15 名在我们康复中心接受住院治疗的比目鱼肌痉挛慢性中风患者参与了这项研究。使用四种不同的刺激速率（0.1、0.2、0.3 和 1 Hz）测试刺激频率相关的抑郁对 H 反射大小的影响。双极电极刺激患侧胫神经。该H-反射从受影响的sideed sidee sidehe记录影响H-反射大小，第一H-反射反应的幅度（H的smine刺激频率有关的抑郁症₁）用作控制和第二H-反射反应的幅度（ H ₂ ) 作为测试。

结果

1Hz、0.3Hz、0.2Hz和0.1Hz频率的H ₂振幅分别是H _{1 的}74.3、84.1、85.5和92.7% 。对于 1 Hz、0.3 Hz 和 0.2 Hz ，H ₂振幅的降低具有统计学意义（分别为p  < 0.001、p  = 0.002、p  = 0.024）。

结论

Ia 传入频率高于 0.1 Hz 的刺激在慢性痉挛患者中诱导了与刺激频率相关的 H 反射大小抑制。发现 H 反射的最佳刺激率为 0.1 Hz。