Electromyographic activity, H-reflex modulation and corticospinal input to forearm motoneurones during active and passive rhythmic movements

Richard G Carson; Stephan Riek; Parveen Bawa

doi:10.1016/S0167-9457(99)00013-5

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Electromyographic activity, H-reflex modulation and corticospinal input to forearm motoneurones during active and passive rhythmic movements

Journal article

Peer reviewed

Electromyographic activity, H-reflex modulation and corticospinal input to forearm motoneurones during active and passive rhythmic movements

Richard G Carson, Stephan Riek and Parveen Bawa

Human Movement Science, Vol.18(2), pp.307-343

1999

DOI: https://doi.org/10.1016/S0167-9457(99)00013-5

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Abstract

Human

Cylic movement

Transcranial magnetic stimulation

Coordination

H-reflex

Electromyography

Voluntary movement

Four subjects produced coordinated movements, consisting of flexion and extension of the wrist in ipsilateral (right wrist only), contralateral (left wrist only), inphase (both wrists in flexion or both in extension) and antiphase (one wrist in flexion, the other in extension) conditions. Electromyographic (EMG) activity was recorded from right wrist flexor and extensor muscles. In one session, transcranial magnetic stimuli (TMS) of the left motor cortex, around threshold intensity, evoked short-latency responses in the right wrist extensors and flexors. In another session, the median nerve at the cubital fossa was stimulated to elicit an H-reflex in the right flexor carpi radialis (rFCR). A movement cycle was divided into 8 segments. In total, 10 identical stimuli were delivered during each segment in each condition, at two movement frequencies. The magnitude of the EMG reponses to TMS was modulated markedly during movements made in the ipsilateral condition, and in both bimanual conditions. EMG activity was greater, and motor-evoked potentials (MEPs) were larger in the antiphase condition than in the inphase condition. When the amplitudes of the MEPs were normalised with respect to background EMG, no significant differences between the bimanual conditions were obtained. For H-reflexes, significant differences between the two bimanual conditions were observed, suggesting differences in levels of excitability of the Ia afferent pathway. These differences were attributed to segmental input associated with changes in muscle length arising from limb movement, and upon descending input to the spinal cord, possibly mediated by Renshaw cell inhibition. During rhythmic passive movement of the right limb, H-reflexes were inhibited and MEPs potentiated in a cyclic fashion. Passive movement of the contralateral left limb resulted in inhibition of both responses.

Details

Title: Electromyographic activity, H-reflex modulation and corticospinal input to forearm motoneurones during active and passive rhythmic movements
Authors: Richard G Carson (Author) - University of Queensland
Stephan Riek (Author) - University of Queensland
Parveen Bawa (Author) - Simon Fraser University
Publication details: Human Movement Science, Vol.18(2), pp.307-343
Publisher: Elsevier BV
DOI: 10.1016/S0167-9457(99)00013-5
ISSN: 1872-7646
Organisation Unit: Graduate Research School; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99472600602621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Neurosciences; Psychology; Psychology, Experimental; Sport Sciences

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