Document Detail

Can stooped posture explain multidirectional postural instability in patients with Parkinson's disease?
MedLine Citation:
PMID:  16096779     Owner:  NLM     Status:  MEDLINE    
To determine the effects of the stooped posture of patients with Parkinson's disease (PD) on postural stability, we compared the kinetic, kinematic, and electromyographic responses of seven subjects with PD and 11 control subjects to eight directions of surface translations. Control subjects were studied in an upright posture and in a stooped posture that mimicked the posture of the PD subjects. When control subjects adopted a stooped posture, peak center of pressure displacements slowed and decreased, reducing stability margins toward values observed in PD subjects. Stooped control subjects, however, responded to translations with large joint angle displacements, whereas PD subjects exhibited small joint angle displacements. Stooping in control subjects did not lead to abnormally directed horizontal forces under each foot or antagonistic muscle co-activation at the hip and trunk, as seen in PD subjects. Upright and stooped control subjects never fell during the trials, whereas PD subjects fell in 16% of the trials. We conclude that stooped posture is a destabilizing posture, but it does not account for abnormal postural responses in PD.
Jesse V Jacobs; Diana M Dimitrova; John G Nutt; Fay B Horak
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2005-08-12
Journal Detail:
Title:  Experimental brain research     Volume:  166     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-10-17     Completed Date:  2006-02-24     Revised Date:  2014-09-22    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  78-88     Citation Subset:  IM    
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MeSH Terms
Biomechanical Phenomena
Gait Disorders, Neurologic / diagnosis,  etiology,  physiopathology
Joints / physiology
Leg / physiopathology
Middle Aged
Movement / physiology*
Muscle Contraction / physiology
Muscle, Skeletal / physiopathology*
Parkinson Disease / diagnosis,  physiopathology*
Postural Balance / physiology*
Grant Support
5 M01 RR000334/RR/NCRR NIH HHS; AG-06457/AG/NIA NIH HHS; R01 AG006457/AG/NIA NIH HHS; R37 AG006457/AG/NIA NIH HHS

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