Recurrent inhibition of soleus α-motoneurons during sustained submaximal plantar flexion
In: Electroencephalography and clinical neurophysiology. Electromyography and motor control, Jg. 101 (1996), Heft 4, S. 334-338
academicJournal
- print, 24 ref
Zugriff:
During 10 min of sustained isometric plantar flexion at 20% of maximal voluntary contraction, recurrent inhibition of soleus α- 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.
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Recurrent inhibition of soleus α-motoneurons during sustained submaximal plantar flexion
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Autor/in / Beteiligte Person: | LÖSCHER, W. N ; CRESSWELL, A. G ; THORSTENSSON, A |
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Zeitschrift: | Electroencephalography and clinical neurophysiology. Electromyography and motor control, Jg. 101 (1996), Heft 4, S. 334-338 |
Veröffentlichung: | Amsterdam: Elsevier Science, 1996 |
Medientyp: | academicJournal |
Umfang: | print, 24 ref |
ISSN: | 0924-980X (print) |
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