Directional specificity of postural muscles in feed-forward postural reactions during fast voluntary arm movements.

Directional specificity of postural muscles in feed-forward postural reactions during fast voluntary arm movements. Research Abstract Details 

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Directional specificity of postural muscles in feed-forward postural reactions during fast voluntary arm movements. Abstract Text:

A S Aruin,M L Latash,

Healthy subjects performed bilateral fast shoulder movements in different directions while standing on a force platform. Anticipatory postural adjustments were seen as changes in the electrical activity of postural muscles as well as displacements of the center of pressure and center of gravity. Postural muscle pairs of agonist-antagonist commonly demonstrated triphasic patterns starting prior to the first electromyographic (EMG) burst in the prime-mover muscle. Proximal postural muscles demonstrated the largest anticipatory increase in the background activity during movements in one of the two opposite directions (forward or backwards). These changes progressively decreased when movements deviated from the preferred direction and frequently disappeared during movements in the opposite direction. The patterns in distal muscles varied across subjects and could demonstrate larger anticipatory changes during movements forward and backwards as compared to movements in intermediate directions. Bilateral addition of inertial loads to the wrists did not change the general anticipatory patterns, while making some of their features more pronounced. Anticipatory postural adjustments were followed by later changes in the activity of postural muscles, also reflected in the mechanical variables. Changes in leg joint angles revealed a "hip-ankle strategy" during shoulder flexions and an "ankle strategy" during shoulder extensions. The study demonstrates different behaviors of proximal and distal muscles during anticipatory postural adjustments in preparation for fast arm movements. We suggest that the proximal muscles produce a general pattern of postural adjustments, while distal muscles take care of fine adjustments that are more likely to vary across subjects.

Directional specificity of postural muscles in feed-forward postural reactions during fast voluntary arm movements. Publishing Authors By Initials

AS Aruin,ML Latash,

For similar psychological phenomena and processes: mental processes: volition research abstracts see: psychological phenomena and processes: mental processes: volition research

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Directional specificity of postural muscles in feed-forward postural reactions during fast voluntary arm movements. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 103

Page Numbers: 323-32

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ISSN: 0014-4819

DAY: 15

MONTH: 02

YEAR: 1995

Directional specificity of postural muscles in feed-forward postural reactions during fast voluntary arm movements. Information

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LANGUAGE: eng

NlmUniqueID: 43312

Directional specificity of postural muscles in feed-forward postural reactions during fast voluntary arm movements. Keywords Mesh Terms:

KEYWORDS: Volition

MESH TERMS: physiology

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Grant and Affiliation Information for Directional specificity of postural muscles in feed-forward postural reactions during fast voluntary arm movements.

AFFILIATION: Department of Physical Medicine and Rehabilitation, Rush-Presbyterian St. Luke's Medical Center, Chicago, IL 60612, USA.

Country: GERMANY

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MEDLINETA: Exp Brain Res

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