Document Detail


Postural responses to unexpected perturbations of balance during reaching.
MedLine Citation:
PMID:  20035321     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To study the interaction between feedforward and feedback modes of postural control, we investigated postural responses during unexpected perturbations of the support surface that occurred during forward reaching in a standing position. We examined postural responses in lower limb muscles of nine human subjects. Baseline measures were obtained when subjects executed reaching movements to a target placed in front of them (R condition) and during postural responses to forward and backward support-surface perturbations (no reaching, P condition) during quiet stance. Perturbations were also given at different delays after the onset of reaching movements (RP conditions) as well as with the arm extended in the direction of the target, but not reaching (P/AE condition). Results showed that during perturbations to reaching (RP), the initial automatic postural response, occurring around 100 ms after the onset of perturbations, was relatively unchanged in latency or amplitude compared to control conditions (P and P/AE). However, longer latency postural responses were modulated to aid in the reaching movements during forward perturbations but not during backward perturbations. Our results suggest that the nervous system prioritizes the maintenance of a stable postural base during reaching, and that later components of the postural responses can be modulated to ensure the performance of the voluntary task.
Authors:
Hari Trivedi; Julia A Leonard; Lena H Ting; Paul J Stapley
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-12-25
Journal Detail:
Title:  Experimental brain research     Volume:  202     ISSN:  1432-1106     ISO Abbreviation:  Exp Brain Res     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-01     Completed Date:  2010-06-30     Revised Date:  2014-09-20    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  485-91     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Electromyography
Hand*
Humans
Leg / physiology*
Male
Motor Activity / physiology*
Muscle, Skeletal / physiology*
Physical Stimulation
Posture / physiology*
Proprioception / physiology*
Task Performance and Analysis
Time Factors
Young Adult
Grant Support
ID/Acronym/Agency:
R01 HD046922/HD/NICHD NIH HHS; R01 NS053822/NS/NINDS NIH HHS; R01 NS053822-04/NS/NINDS NIH HHS
Comments/Corrections

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


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