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| Research article summary (published 12 Aug 2003): |
Gradual increment/decrement of isometric force modulates soleus stretch reflex response in humans.
Full Abstract
We investigated how a gradual isometric force-increment and -decrement task modulates the behavior of a soleus stretch reflex. Six healthy subjects performed isometric plantar-flexion torque exertion tasks in which they adjusted the torque level to a target changing triangularly (3 s/cycle; the amplitude is 15% of maximal voluntary isometric contraction (MVC)) or to constant targets (3.75, 7.5, and 11.25% of MVC). The magnitude of the short latency stretch reflex evoked by dorsi-flexing mechanical perturbation was strongly modulated by the muscle contraction states; it was the largest and the smallest for the torque-increment and -decrement phases, respectively. On the other hand, within each muscle contraction, the magnitude was independent of the torque level. Similar results were observed for the medium latency stretch reflex. These results indicate that when the central nervous system increases or decreases the muscular force, it simultaneously regulates the sensitivity of the stretch reflex.
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Author information
Author/s: Kimura, Toshitaka (T); Nozaki, Daichi (D); Nakazawa, Kimitaka (K); Akai, Masami (M); Ohtsuki, Tatsuyuki (T);
Affiliation: Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1, Komaba, Meguro, Tokyo 153-8902, Japan. cc07706@mail.ecc.u-tokyo.ac.jp
Journal and publication information
Publication Type: Journal Article
Journal: Neuroscience letters (Neurosci Lett), published in Ireland. (Language: eng)
Reference: 2003-Aug; vol 347 (issue 1) : pp 25-8
Dates: Created 2003/07/16; Completed 2003/08/21; Revised 2004/11/17;
PMID: 12865133, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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