Document Detail

Modulation of proprioceptive inflow when initiating a step influences postural adjustments.
MedLine Citation:
PMID:  19834696     Owner:  NLM     Status:  MEDLINE    
A synergistic inclination of the whole body towards the supporting leg is required when producing a stepping movement. It serves to shift the centre of mass towards the stance foot. While the importance of sensory information in the setting of this postural adjustment is undisputed, it is currently unknown the extent to which proprioceptive afferences (Ia) give rise to postural regulation during stepping movement when the availability of other sensory information relying on static linear acceleration (gravity) is no longer sensed in microgravity. We tested this possibility asking subjects to step forward with their eyes closed in normo- and microgravity environments. At the onset of the stepping movement, we vibrated the ankle muscles acting in the lateral direction to induce modification of the afferent inflow (Ia fibres). Vibration-evoked movement (perceived movement) was in the same direction as the forthcoming body shift towards the supporting side (current movement). A control condition was performed without vibration. In both environments, when vibration was applied, the hip shift towards the supporting side decreased. These postural modifications occurred, however, earlier in normogravity before initiating the stepping movement than in microgravity (i.e. during the completion of the stepping movement). Our results suggest that proprioceptive information induced by vibration and afferent inflow related to body movement exaggerated sense of movement. This biased perception led to the postural adjustment decrease. We propose that in both environments, proprioceptive inflow enables the subject to scale the postural adjustments, provided that body motion-induced afferences are present to activate this postural control.
Hélène Ruget; Jean Blouin; Thelma Coyle; Laurence Mouchnino
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-10-16
Journal Detail:
Title:  Experimental brain research     Volume:  201     ISSN:  1432-1106     ISO Abbreviation:  Exp Brain Res     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-03-05     Completed Date:  2010-05-25     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  297-305     Citation Subset:  IM    
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MeSH Terms
Biomechanical Phenomena
Foot / physiology
Leg / innervation,  physiology
Movement / physiology
Muscle, Skeletal / innervation,  physiology
Posture / physiology*
Proprioception / physiology*

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