Abstract:
:Sudden stretch of active muscle typically results in two characteristic electromyographic responses: the short latency M1 and the long latency M2. The M1 response originates from the monosynaptic Ia afferent reflex pathway. The M2 response is less well understood and is likely a compound response to different afferent inputs mediated by spinal and transcortical pathways. In this study the possible contribution of the Ia afferent pathway to the M2 response was investigated. A mechanism was hypothesized in which the M1 response synchronizes the motoneurons, and therewith their refractory periods. Stretch perturbation experiments were performed on the wrist and results were compared with a computational model of a pool of motoneurons receiving tonic and Ia afferent input. The simulations showed the same stretch amplitude, velocity, and duration-dependent characteristics on the M2 as found experimentally. It was concluded that the stretch duration effect of the M2 likely originates from the proposed Ia afferent mediated mechanism.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Schuurmans J,de Vlugt E,Schouten AC,Meskers CG,de Groot JH,van der Helm FCdoi
10.1007/s00221-008-1647-7subject
Has Abstractpub_date
2009-03-01 00:00:00pages
491-500issue
4eissn
0014-4819issn
1432-1106journal_volume
193pub_type
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