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Conditioning Ia-afferent stimulation reduces the soleus Hoffman reflex in humans when muscle spindles are assumed to be inactive.
Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, Laboratoriet för biomekanik och motorisk kontroll (BMC).ORCID-id: 0000-0002-7879-9188
Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, Laboratoriet för biomekanik och motorisk kontroll (BMC).
2004 (Engelska)Ingår i: Neuroscience Letters, ISSN 0304-3940, E-ISSN 1872-7972, Vol. 366, nr 3, s. 250-3Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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 90 degrees 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 1 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.

Ort, förlag, år, upplaga, sidor
2004. Vol. 366, nr 3, s. 250-3
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URN: urn:nbn:se:gih:diva-551DOI: 10.1016/j.neulet.2004.05.044PubMedID: 15288428OAI: oai:DiVA.org:gih-551DiVA, id: diva2:173862
Tillgänglig från: 2009-02-17 Skapad: 2009-02-16 Senast uppdaterad: 2017-12-13Bibliografiskt granskad

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Nordlund Ekblom, Maria MThorstensson, Alf

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