Document Detail

Evaluation of the lambda model for human postural control during ankle strategy.
MedLine Citation:
PMID:  14504941     Owner:  NLM     Status:  MEDLINE    
An accurate modeling of human stance might be helpful in assessing postural deficit. The objective of this article is to validate a mathematical postural control model for quiet standing posture. The postural dynamics is modeled in the sagittal plane as an inverted pendulum with torque applied at the ankle joint. The torque control system is represented by the physiological lambda model. Two neurophysiological command variables of the central nervous system, designated lambda and micro, establish the dynamic threshold muscle at which motoneuron recruitment begins. Kinematic data and electromyographic signals were collected on four young males in order to measure small voluntary sway and quiet standing posture. Validation of the mathematical model was achieved through comparison of the experimental and simulated results. The mathematical model allows computation of the unmeasurable neurophysiological commands lambda and micro that control the equilibrium position and stability. Furthermore, with the model it is possible to conclude that low-amplitude body sway during quiet stance is commanded by the central nervous system.
Philippe Micheau; Aymeric Kron; Paul Bourassa
Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2003-08-06
Journal Detail:
Title:  Biological cybernetics     Volume:  89     ISSN:  0340-1200     ISO Abbreviation:  Biol Cybern     Publication Date:  2003 Sep 
Date Detail:
Created Date:  2003-09-23     Completed Date:  2003-11-17     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7502533     Medline TA:  Biol Cybern     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  227-36     Citation Subset:  IM    
Mechanical Engineering Department, Université de Sherbrooke, 2500 boulevard de l'Université Sherbrooke, Québec, J1K2R1, Canada.
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MeSH Terms
Ankle Joint / physiology*
Computer Simulation
Electromyography / methods
Models, Biological*
Movement / physiology
Muscle Contraction
Postural Balance
Posture / physiology*
Reproducibility of Results

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