Document Detail


Inverse dynamic investigation of voluntary leg lateral movements in weightlessness: a new microgravity-specific strategy.
MedLine Citation:
PMID:  15713298     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study deals with the quantitative assessment of exchanged forces and torques at the restraint point during whole body posture perturbation movements in long-term microgravity. The work was based on the results of a previous study focused on trunk bending protocol, which suggested that the minimization of the torques exchanged at the restraint point could be a strategy for movement planning in microgravity (J. Biomech. 36(11) (2003) 1691). Torques minimization would lead to the optimization of muscles activity, to the minimization of energy expenditure and, ultimately, to higher movement control capabilities. Here, we focus on leg lateral abduction from anchored stance. The analysis was based on inverse dynamic modelling, leading to the estimation of the total angular momentum at the supporting ankle joint. Results agree with those obtained for trunk bending movements and point out a consistent minimization of the torques exchanged at the restraint point in weightlessness. Given the kinematic features of the examined motor task, this strategy was interpreted as a way to master the rotational dynamic effects on the frontal plane produced by leg lateral abduction. This postural stabilizing effects was the result of a multi-segmental compensation strategy, consisting of the counter rotation of the supporting limb and trunk accompanying the leg raising. The observed consistency of movement-posture co-ordination patterns among lateral leg raising and trunk bending is put forward as a novel interpretative issue of the adaptation mechanisms of the motor system to sustained microgravity, especially if one considers the completely different kinematics of the centre of mass, which was observed in weightlessness for these two motor tasks.
Authors:
Alessandra Pedrocchi; Guido Baroni; Antonio Pedotti; Jean Massion; Giancarlo Ferrigno
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of biomechanics     Volume:  38     ISSN:  0021-9290     ISO Abbreviation:  J Biomech     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-02-16     Completed Date:  2005-06-30     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  769-77     Citation Subset:  IM; S    
Affiliation:
NITLAB, TBM lab, Department of Bioengineering, Polytechnic of Milan, Piazza Leonardo da Vinci 33, 20133 Milan, Italy. pedrocchi@biomed.polimi.it
Space Flight Mission:
Flight Experiment; Mir Project; Soyuz TM22 Project; long duration; manned
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MeSH Terms
Descriptor/Qualifier:
Adult
Ankle Joint / physiology
Astronauts
Biomechanics
Humans
Leg / physiology*
Motor Activity / physiology
Movement / physiology*
Posture / physiology
Space Flight
Torque
Weightlessness*

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


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