Document Detail

Hindlimb suspension inhibits air-righting due to altered recruitment of neck and back muscles in rats.
MedLine Citation:
PMID:  15541201     Owner:  NLM     Status:  MEDLINE    
Effects of 9-week hindlimb suspension and 8-week recovery on air-righting reaction in response to drop from a supine position were studied in adult rats. The righting time in rats at the end of suspension (approximately 220 ms) was longer than the age-matched controls (approximately 120 ms, p <0.05). The unloading-related change in righting time was accompanied by lowered activities of electromyogram (EMG) and altered recruitment of both neck and back muscles at a specific stage of drop. After 8 weeks of reambulation, righting time recovered toward the control level (approximately 153 ms, p <0.05), but the EMG activity of back muscle was still less than controls. In contrast, the EMG of neck muscle during fall was even increased. The differences in the characteristics of the muscle fibers between two groups were minor. It is suggested that inhibition of recruitment, rather than the changes in the fiber characteristics, of neck and back muscles is one of the major causes of the slow air-righting.
F Kawano; X D Wang; Y B Lan; H Yoneshima; A Ishihara; M Igarashi; Y Ohira
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Japanese journal of physiology     Volume:  54     ISSN:  0021-521X     ISO Abbreviation:  Jpn. J. Physiol.     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-11-15     Completed Date:  2005-04-12     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2985184R     Medline TA:  Jpn J Physiol     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  229-42     Citation Subset:  IM    
School of Health and Sport Sciences, Osaka University, Toyonaka City, Osaka, 560-0043 Japan.
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MeSH Terms
Adaptation, Physiological / physiology
Back / physiology*
Hindlimb Suspension / methods*
Movement / physiology*
Muscle Contraction / physiology*
Muscle Fibers, Skeletal / physiology*
Muscle, Skeletal / physiology*
Neck Muscles / physiology
Postural Balance / physiology
Posture / physiology
Rats, Wistar
Recruitment, Neurophysiological / physiology*
Reflex, Vestibulo-Ocular / physiology

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