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|Title:||Observations on the Variability of the H Reflex in Human Soleus|
|Citation:||Muscle and Nerve, 1999; 22(3):341-346|
|Publisher:||JOHN WILEY & SONS INC|
|Abstract:||H reflexes were evoked in human soleus by stimulating the tibial nerve at a constant intensity. Each trial was then assigned to one of three groups on the basis of the amplitude of its H reflex; all trials in each group were then full-wave rectified and reaveraged. There was a strong positive relationship between the amplitude of the H reflex and the level of electromyographic activity in the muscle at the time of onset of the H reflex, which reflects the activity of the motoneuronal pool when the afferent volley arrived. Thus, much of the variability of the H reflex is due to small changes in the level of activation of the motoneuronal pool during repeated trials. The steady torque preceding the H reflex was a poor predictor of the H-reflex amplitude, presumably because of the delay between the changes in the electrical activity of motoneurons and the mechanical outcome thereof.|
|Keywords:||Ankle; Muscle, Skeletal; Tibial Nerve; Humans; Electromyography; Electric Stimulation; Isometric Contraction; H-Reflex; Torque; Adult; Middle Aged|
|Appears in Collections:||Physiology publications|
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