Does the coordination between posture and movement during human whole-body reaching ensure center of mass stabilization?

Does the coordination between posture and movement during human whole-body reaching ensure center of mass stabilization? Research Abstract Details 

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Does the coordination between posture and movement during human whole-body reaching ensure center of mass stabilization? Abstract Text:

P J Stapley,T Pozzo,G Cheron,A Grishin,

The whole-body center of mass (CoM) has been classically regarded as the stabilized reference value for human voluntary movements executed upon a fixed base of support. Axial synergies (opposing displacements of head and trunk with hip segments) are believed to minimize antero-posterior (A/P) CoM displacements during forward trunk movements. It is also widely accepted that anticipatory postural adjustments (APAs) create forces of inertia that counteract disturbances arising from the moving segment(s). In the present study, we investigated CoM stabilization by axial synergies and APAs during a whole-body reaching task. Subjects reached towards an object placed on the ground in front of them in their sagittal plane using a strategy of coordinated trunk, knee, and hip flexion. The reaching task imposed constraints on arm-trajectory formation and equilibrium maintenance. To manipulate equilibrium constraints, differing conditions of distance and speed were imposed. The comparison of distance conditions suggested that axial synergies were not entirely devoted to CoM stabilization: backward A/P hip displacements reduced as head and trunk forward A/P displacements increased. Analysis of upper- and lower-body centers of mass in relation to the CoM also showed no strict minimization of A/P CoM displacements. Mechanical analysis of the effects of APAs revealed that, rather than acting to stabilize the CoM, APAs created necessary conditions for forward CoM displacement within the base of support in each condition. The results have implications for the CoM as the primary stabilized reference for posture and movement coordination during whole-body reaching and for the central control of posture and voluntary movement.

Does the coordination between posture and movement during human whole-body reaching ensure center of mass stabilization? Publishing Authors By Initials

PJ Stapley,T Pozzo,G Cheron,A Grishin,

For similar psychological phenomena and processes: psychomotor performance research abstracts see: psychological phenomena and processes: psychomotor performance research

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Does the coordination between posture and movement during human whole-body reaching ensure center of mass stabilization? Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 129

Page Numbers: 134-46

Journal Abbreviation:

ISSN: 0014-4819

DAY: 15

MONTH: Nov

YEAR: 1999

Does the coordination between posture and movement during human whole-body reaching ensure center of mass stabilization? Information

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LANGUAGE: eng

NlmUniqueID: 43312

Does the coordination between posture and movement during human whole-body reaching ensure center of mass stabilization? Keywords Mesh Terms:

KEYWORDS: Psychomotor Performance

MESH TERMS: physiology

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Grant and Affiliation Information for Does the coordination between posture and movement during human whole-body reaching ensure center of mass stabilization?

AFFILIATION: Groupe d'Analyse du Mouvement (GAM), UFR STAPS BP 27877, Université de Bourgogne, F-21078 Dijon Cedex, France.

Country: GERMANY

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MEDLINETA: Exp Brain Res

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