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https://hdl.handle.net/2440/11974
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Type: | Journal article |
Title: | Observations on the Variability of the H Reflex in Human Soleus |
Author: | Funase, K. Miles, T. |
Citation: | Muscle and Nerve, 1999; 22(3):341-346 |
Publisher: | JOHN WILEY & SONS INC |
Issue Date: | 1999 |
ISSN: | 0148-639X 1097-4598 |
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 |
DOI: | 10.1002/(SICI)1097-4598(199903)22:3<341::AID-MUS6>3.0.CO;2-R |
Published version: | http://dx.doi.org/10.1002/(sici)1097-4598(199903)22:3%3C341::aid-mus6%3E3.0.co;2-r |
Appears in Collections: | Aurora harvest 2 Physiology publications |
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