Document Detail


Destabilization of human balance control by static and dynamic head tilts.
MedLine Citation:
PMID:  15961313     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To better understand the effects of varying head movement frequencies on human balance control, 12 healthy adult humans were studied during static and dynamic (0.14, 0.33, 0.6 Hz) head tilts of +/- 30 degrees in the pitch and roll planes. Postural sway was measured during upright stance with eyes closed and altered somatosensory inputs provided by a computerized dynamic posturography (CDP) system. Subjects were able to maintain upright stance with static head tilts, although postural sway was increased during neck extension. Postural stability was decreased during dynamic head tilts, and the degree of destabilization varied directly with increasing frequency of head tilt. In the absence of vision and accurate foot support surface inputs, postural stability may be compromised during dynamic head tilts due to a decreased ability of the vestibular system to discern the orientation of gravity. This instability may compound the risk of falling following recovery from balance disorders or adaptation to altered gravity conditions such as space flight. Thus, dynamic head tilts may improve the diagnostic sensitivity of computerized dynamic posturography, particularly for healthy subjects recovering from temporary balance control deficits.
Authors:
William H Paloski; Scott J Wood; Alan H Feiveson; F Owen Black; Emma Y Hwang; Millard F Reschke
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2005-06-14
Journal Detail:
Title:  Gait & posture     Volume:  23     ISSN:  0966-6362     ISO Abbreviation:  Gait Posture     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-03-01     Completed Date:  2006-08-10     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9416830     Medline TA:  Gait Posture     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  315-23     Citation Subset:  IM    
Affiliation:
Neurosciences Laboratory, Human Adaptation and Countermeasures Office, NASA Johnson Space Center, Houston, TX, USA. wpaloski@ems.jsc.nasa.gov
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology
Adult
Female
Gravitation
Head Movements / physiology*
Humans
Male
Middle Aged
Orientation / physiology
Postural Balance / physiology*
Posture / physiology
Signal Processing, Computer-Assisted
Grant Support
ID/Acronym/Agency:
00205//PHS HHS

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


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