Document Detail

Whiplash-associated disorders affect postural reactions to antero-posterior support surface translations during sitting.
MedLine Citation:
PMID:  19201611     Owner:  NLM     Status:  MEDLINE    
Previous studies have shown that individuals with WAD display decreased postural stability during standing and walking tasks. However, their ability to maintain seated upright posture has never been investigated. The objective of this study was to characterize kinematic and electromyographic postural stabilization patterns in individuals with chronic WAD and to compare these patterns with those in an able-bodied control group. Ten individuals with WAD and an age- and gender-matched group of healthy individuals were exposed to sudden forward and backward support surface translations while they were seated. Neck and trunk muscle activity and angular displacements as well as centers of mass (COMs) linear displacements at four levels of the head and trunk were computed. The displacement onset of the combined head, arms and trunk COM was significantly delayed in persons with WAD. However, their peak trunk angles were smaller and were reached sooner. In the WAD group, the activation onset of the lumbar erector spinae was less affected by perturbation direction and the sternocleidomastoid muscle, a neck flexor, showed a trend towards being activated later, compared to the healthy group. These results suggest that individuals with WAD may alter stretch reflex threshold and/or elicit a learned response for pain avoidance that may be direction-specific. Such findings highlight the importance of assessing both spatial and temporal characteristics across different levels of the spinal musculoskeletal system to evaluate multidirectional postural responses in WAD individuals.
Julie N Côté; Isabelle Patenaude; Nancy St-Onge; Joyce Fung
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-02-07
Journal Detail:
Title:  Gait & posture     Volume:  29     ISSN:  1879-2219     ISO Abbreviation:  Gait Posture     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-04-06     Completed Date:  2009-07-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9416830     Medline TA:  Gait Posture     Country:  England    
Other Details:
Languages:  eng     Pagination:  603-11     Citation Subset:  IM    
Department of Kinesiology and Physical Education, McGill University, 475 Pine Avenue West, Montreal, Que. H2W 1S4, Canada.
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MeSH Terms
Analysis of Variance
Case-Control Studies
Middle Aged
Posture / physiology*
Whiplash Injuries / physiopathology*

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