Please use this identifier to cite or link to this item:
|Scopus||Web of Science®||Altmetric|
|Title:||Trial-to-trial fluctuations in H-reflexes and motor evoked potentials in human wrist flexor|
|Citation:||Neuroscience Letters, 1999; 271(1):25-28|
|Publisher:||ELSEVIER SCI IRELAND LTD|
|Abstract:||The H-reflexes and the motor potentials (MEPs) evoked by electromagnetic brain stimulation in the human wrist flexor were recorded over many trials. The responses from each stimulus at two steady levels of muscle activation were sorted into three groups, based on their amplitudes. The electromyogram (EMG) in each of these groups was rectified and averaged. The level of pre-response muscle activity was found to correlate with the amplitude of both the averaged H-reflexes and the averaged MEPs. This suggests that much of the amplitude fluctuations of both H-reflexes and MEPs can be attributed to moment-to-moment changes in the level of activity of the motoneurone pool. Overall, however, the amplitude of MEPs increased more rapidly than the amplitude of H-reflexes as the pre-stimulus EMG activity increased. This is probably because, while the amplitude of H-reflexes depends primarily on the level of motoneurone pool excitability, the amplitude of an MEP depends not only on this, but also on the excitability of the motor cortex, and the former is to some extent also dependent on the latter.|
|Keywords:||Muscle, Skeletal; Wrist Joint; Brain; Humans; Electromyography; Evoked Potentials, Motor; H-Reflex; Electromagnetic Fields; Adult; Male|
|Appears in Collections:||Physiology publications|
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.