Influences of experimental factors on spinal stretch reflex latency and amplitude in the human triceps surae

被引:9
作者
Blackburn, JT
Mynark, RG
Padua, DA
Guskiewicz, KM
机构
[1] Auburn Univ, Dept Hlth & Human Performance, Auburn, AL 36849 USA
[2] Univ N Carolina, Dept Exercise & Sport Sci, Chapel Hill, NC USA
关键词
spinal stretch reflex; automatic gain; perturbation velocity; perturbation amplitude;
D O I
10.1016/j.jelekin.2005.05.001
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The spinal stretch reflex (SSR) is commonly assessed via electromyographic (EMG) analysis of joint perturbations inducing changes in muscle length. Previous literature indicates that when large experimental changes in magnitude of agonist background EMG, perturbation velocity, and perturbation amplitude are employed, SSR latency and amplitude are significantly altered. The purpose of this investigation was to evaluate the relative dependence of SSR latency and amplitude on inherent variability in these experimental variables. Soleus SSR latency and amplitude were assessed in 40 healthy subjects following dorsiflexion perturbation under an active state (similar to 14% MVC). Experimental variables displayed limited variability (means +/- SD): soleus background EMG (13.47 +/- 7.08% MVC), perturbation velocity (96.1 +/- 30 degrees/s), and perturbation amplitude (4 +/- 1 degrees). SSR latency was not significantly related to soleus background EMG (r = 0.189), perturbation velocity (r = 0.213), or perturbation amplitude (r = 0.202). Similarly, SSR amplitude was not significantly related to soleus background EMG (r = 0.306), perturbation velocity (r = 0.053), or perturbation amplitude (r = 0.056). Variability in experimental variables was much smaller than what has been reported in the literature to significantly impact SSR characteristics. These results suggest that SSR latency and amplitude are independent of agonist background EMG, perturbation velocity, and perturbation amplitude when experimental variability is relatively limited. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:42 / 50
页数:9
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