Document Detail

Influence of postural anxiety on postural reactions to multi-directional surface rotations.
MedLine Citation:
PMID:  15295016     Owner:  NLM     Status:  MEDLINE    
Previous studies have shown significant effects of increased postural anxiety in healthy young individuals when standing quietly or performing voluntary postural tasks. However, little is known about the influence of anxiety on reactive postural control. The present study examined how increased postural anxiety influenced postural reactions to unexpected surface rotations in multiple directions. Ten healthy young adults (mean age: 25.5 yr, range: 22-27 yr) were required to recover from unexpected rotations of the support surface (7.5 degrees amplitude, 50 degrees/s velocity) delivered in six different directions while standing in a low postural threat (surface height: 60 cm above ground) or high postural threat (surface height: 160 cm above ground) condition. Electromyographic data from 12 different postural leg, hip, and trunk muscles was collected simultaneously. Full body kinematic data were also used to determine total body center of mass (COM) and segment displacements. Four distinct changes were observed with increased postural anxiety: increased amplitude in balance-correcting responses (120-220 ms) in all leg, trunk, and arm muscles; decreased onset latency of deltoid responses; reduced magnitude of COM displacement; and reduced angular displacement of leg, pelvis, and trunk. These observations suggest that changes in dynamic postural responses with increased anxiety are mediated by alterations in neuro-muscular control mechanisms and thus may contribute significantly to the pathophysiology of balance deficits associated with aging or neurological disease.
M G Carpenter; J S Frank; A L Adkin; A Paton; J H J Allum
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-08-04
Journal Detail:
Title:  Journal of neurophysiology     Volume:  92     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2004-11-19     Completed Date:  2004-12-30     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3255-65     Citation Subset:  IM    
Department of Kinesiology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
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MeSH Terms
Anxiety / physiopathology*
Muscle, Skeletal / physiology
Perception / physiology
Postural Balance / physiology*
Posture / physiology*

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

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