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Recurrent inhibitio...
Recurrent inhibition of soleus alpha-motoneurons during a sustained submaximal plantar flexion.
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Löscher, W N (author)
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Cresswell, A G (author)
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- Thorstensson, Alf (author)
- Gymnastik- och idrottshögskolan,Laboratoriet för biomekanik och motorisk kontroll (BMC)
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(creator_code:org_t)
- 1996
- 1996
- English.
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In: Electroencephalography and Clinical Neurophysiology. - 0013-4694. ; 101:4, s. 334-8
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https://doi.org/10.1...
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Abstract
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- 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.
Publication and Content Type
- ref (subject category)
- art (subject category)
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