Conditioning Ia-afferent stimulation reduces the soleus Hoffman reflex in humans when muscle spindles are assumed to be inactive

Nordlund, MM, Thorstensson, A and Cresswell, AG (2004) Conditioning Ia-afferent stimulation reduces the soleus Hoffman reflex in humans when muscle spindles are assumed to be inactive. Neuroscience Letters, 366 3: 250-253. doi:10.1016/j.neulet.2004.05.044


Author Nordlund, MM
Thorstensson, A
Cresswell, AG
Title Conditioning Ia-afferent stimulation reduces the soleus Hoffman reflex in humans when muscle spindles are assumed to be inactive
Journal name Neuroscience Letters   Check publisher's open access policy
ISSN 0304-3940
Publication date 2004-01-01
Year available 2004
Sub-type Article (original research)
DOI 10.1016/j.neulet.2004.05.044
Open Access Status DOI
Volume 366
Issue 3
Start page 250
End page 253
Total pages 4
Place of publication Clare
Publisher Elsevier Sci Ireland Ltd
Language eng
Abstract Despite higher neural activation during active as compared to passive muscle shortening, Hoffman reflexes (H-reflexes) are similar. This may be explained by homosynaptic post-activation depression (HPAD) of Ia-afferents being present during active shortening. Accordingly, it was investigated whether conditioning electrical stimulation of the tibial nerve reduced the H-reflex less during active than passive shortening. The effects of two conditioning modes (0.2 and 1 Hz) were compared to a control mode without conditioning. H-reflexes and M-waves were elicited as the ankle passed 90degrees with the soleus muscle undergoing passive or active (20% MVC) lengthening or shortening. Conditioning had no effect during active shortening. In contrast, during passive shortening, the H:M of the I Hz mode was significantly less than that of the 0.2 Hz and control modes. In lengthening, H:M was unaffected by conditioning. These findings support that HPAD reduces the synaptic efficacy of Ia-afferents during active shortening, active and passive lengthening, but not passive shortening. (C) 2004 Elsevier Ireland Ltd. All rights reserved.
Keyword Neurosciences
presynaptic inhibition
eccentric
concentric
motoneurone
electromyography
Post-activation Depression
H-reflex
Contractions
Modulation
Q-Index Code C1
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Human Movement and Nutrition Sciences Publications
 
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Created: Wed, 17 Oct 2007, 23:04:14 EST