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Recurrent inhibition of soleus alpha-motoneurons during a sustained submaximal plantar flexion.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Laboratory for Biomechanics and Motor Control.
1996 (English)In: Electroencephalography and Clinical Neurophysiology, ISSN 0013-4694, E-ISSN 0013-4649, Vol. 101, no 4, 334-8 p.Article in journal (Refereed) Published
Abstract [en]

During 10 min of sustained isometric plantar flexion at 20% of maximal voluntary contraction, recurrent inhibition of soleus alpha-motoneurons was studied in 9 healthy subjects (age 22-37 years). Recurrent inhibition was brought about by a conditioning H-reflex and assessed by a test H-reflex delivered 10 ms later. The amplitude of the test H-reflex during the tenth minute of the contraction (16.9 +/- 13.2% of the maximal compound motor action potential) was significantly increased as compared to that during the first minute (9.8 +/- 7.6%), while the conditioning H-reflex remained unchanged. Concomitantly, muscle fatigue was evidenced by a significant increase in amplitude of the soleus electromyogram. The increase of the test-H-reflex amplitude implies that a decrease in recurrent inhibition occurred during the sustained submaximal contraction, which contrasts results from studies on maximal voluntary contractions. These results indicate a modulation of soleus Renshaw interneurons, which is likely to serve the purpose of optimising motor unit recruitment and firing rates of this muscle during a sustained submaximal contraction.

Place, publisher, year, edition, pages
1996. Vol. 101, no 4, 334-8 p.
Identifiers
URN: urn:nbn:se:gih:diva-815PubMedID: 8761043OAI: oai:DiVA.org:gih-815DiVA: diva2:174725
Available from: 2009-02-24 Created: 2009-02-24 Last updated: 2011-05-03Bibliographically approved

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