Document Detail

Lateral balance organisation in human stance in response to a random or predictable perturbation.
MedLine Citation:
PMID:  9928835     Owner:  NLM     Status:  MEDLINE    
The effect of the predictability of perturbation to standing balance was evaluated in terms of the muscle activity and response dynamics of five subjects exposed to horizontal forces at the pelvis producing sideways or forward sway. Rapid (EMG onset latencies of 70-80 ms recorded from the left gluteus medius and gastrocnemius) and qualitatively different patterns of response were produced by forward pushes and pushes to either side. However, the EMG response to left push was constant in pattern and timing, whether the push direction was constant and, therefore, predictable over a block of trials or whether the left push trials were interleaved randomly with right push or forward push trials. Moreover, there were no systematic effects of perturbation direction uncertainty on the latency and rate of increase of ground reaction forces. We conclude that prior information does not speed postural responses that differ quantitatively according to the direction of perturbation to balance.
M Gilles; A M Wing; S G Kirker
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Experimental brain research     Volume:  124     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  1999 Jan 
Date Detail:
Created Date:  1999-03-29     Completed Date:  1999-03-29     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  137-44     Citation Subset:  IM; S    
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MeSH Terms
Muscle, Skeletal / physiology*
Postural Balance / physiology*
Posture / physiology
Predictive Value of Tests
Reaction Time / physiology

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

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