Trial-to-trial fluctuations in H-reflexes and motor evoked potentials in human wrist flexor

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dc.contributor.authorFunase, K.
dc.contributor.authorMiles, T.
dc.contributor.authorGooden, B.
dc.date.issued1999
dc.description.abstractThe 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.
dc.identifier.citationNeuroscience Letters, 1999; 271(1):25-28
dc.identifier.doi10.1016/S0304-3940(99)00467-X
dc.identifier.issn0304-3940
dc.identifier.issn1872-7972
dc.identifier.urihttp://hdl.handle.net/2440/11981
dc.language.isoen
dc.publisherELSEVIER SCI IRELAND LTD
dc.source.urihttps://doi.org/10.1016/s0304-3940(99)00467-x
dc.subjectMuscle, Skeletal
dc.subjectWrist Joint
dc.subjectBrain
dc.subjectHumans
dc.subjectElectromyography
dc.subjectEvoked Potentials, Motor
dc.subjectH-Reflex
dc.subjectElectromagnetic Fields
dc.subjectAdult
dc.subjectMale
dc.titleTrial-to-trial fluctuations in H-reflexes and motor evoked potentials in human wrist flexor
dc.typeJournal article
pubs.publication-statusPublished

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