Document Detail

Interlimb postural coordination in the standing cat.
MedLine Citation:
PMID:  16527856     Owner:  NLM     Status:  MEDLINE    
The dorsal-side-up body posture in standing quadrupeds is maintained by coordinated activity of four limbs. We studied this coordination in the cat standing on the platform periodically tilted in the frontal plane. By suspending different body parts, we unloaded one, two, or three limbs. The activity of selected extensor muscles and the contact forces under the limbs were recorded. With all four limbs on the platform, extensors of the fore- and hindlimbs increased their activity in parallel during ipsilateral downward tilt. With two forelimbs on the platform, this muscular pattern persisted in the forelimbs and in the suspended hindlimbs. With two hindlimbs on the platform, the muscular pattern persisted only in the hindlimbs, but not in the suspended forelimbs. These results suggest that coordination between the two girdles is based primarily on the influences of the forelimbs upon the hindlimbs. However, these influences do not necessarily determine the responses to tilt in the hindlimbs. This was demonstrated by antiphase tilting of the fore- and hindquarters. Under these conditions, the extensors of the fore- and hindlimbs appeared uncoupled and modulated in antiphase, suggesting an independent control of posture in the fore- and hindquarters. With only one limb supporting the shoulder or hip girdle, a muscular pattern with normal phasing was observed in both limbs of that girdle. This finding suggests that reflex mechanisms of an individual limb generate only a part of postural corrections; another part is produced on the basis of crossed influences.
Tatiana G Deliagina; Mikhail G Sirota; Pavel V Zelenin; Grigori N Orlovsky; Irina N Beloozerova
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2006-03-09
Journal Detail:
Title:  The Journal of physiology     Volume:  573     ISSN:  0022-3751     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-05-16     Completed Date:  2006-07-12     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  211-24     Citation Subset:  IM    
The Nobel Institute for Neurophysiology, Department of Neuroscience, Karolinska Institute, SE-17177, Stockholm, Sweden.
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MeSH Terms
Conditioning (Psychology)
Forelimb / physiology*
Hindlimb / physiology*
Hip Joint / physiology
Muscle, Skeletal / physiology
Posture / physiology*
Shoulder Joint / physiology
Weight-Bearing / physiology
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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