Functional synergies underlying control of upright posture during changes in head orientation

Studies of human upright posture typically have stressed the need to control ankle and hip joints to achieve postural stability. Recent studies, however, suggest that postural stability involves multi degree-of-freedom (DOF) coordination, especially when performing supra-postural tasks. This study i...

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Published in:PloS one 2012-08, Vol.7 (8), p.e41583-e41583
Main Authors: Park, Eunse, Schöner, Gregor, Scholz, John P
Format: Article
Language:English
Subjects:
Adult
Ankle
Ankle Joint - physiopathology
Biology
Biomechanical Phenomena
Biomechanics
Brain research
Computer simulation
Control stability
Coordination
Covariance
Degrees of freedom
Eye movements
Female
Head
Head movement
Head Movements - physiology
Hip
Hip Joint - physiopathology
Humans
Kinematics
Male
Medicine
Models, Biological
Neck
Orientation
Postural Balance - physiology
Posture
Posture - physiology
Science programs
Spine
Spine (cervical)
Surgical implants
Tracking
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Schöner, Gregor
Scholz, John P
description Studies of human upright posture typically have stressed the need to control ankle and hip joints to achieve postural stability. Recent studies, however, suggest that postural stability involves multi degree-of-freedom (DOF) coordination, especially when performing supra-postural tasks. This study investigated kinematic synergies related to control of the body's position in space (two, four and six DOF models) and changes in the head's orientation (six DOF model). Subjects either tracked a vertically moving target with a head-mounted laser pointer or fixated a stationary point during 4-min trials. Uncontrolled manifold (UCM) analysis was performed across tracking cycles at each point in time to determine the structure of joint configuration variance related to postural stability or tracking consistency. The effect of simulated removal of covariance among joints on that structure was investigated to further determine the role of multijoint coordination. Results indicated that cervical joint motion was poorly coordinated with other joints to stabilize the position of the body center of mass (CM). However, cervical joints were coordinated in a flexible manner with more caudal joints to achieve consistent changes in head orientation. An understanding of multijoint coordination requires reference to the stability/control of important performance variables. The nature of that coordination differs depending on the reference variable. Stability of upright posture primarily involved multijoint coordination of lower extremity and lower trunk joints. Consistent changes in the orientation of the head, however, required flexible coordination of those joints with motion of the cervical spine. A two-segment model of postural control was unable to account for the observed stability of the CM position during the tracking task, further supporting the need to consider multijoint coordination to understand postural stability.
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subjects Adult
Ankle
Ankle Joint - physiopathology
Biology
Biomechanical Phenomena
Biomechanics
Brain research
Computer simulation
Control stability
Coordination
Covariance
Degrees of freedom
Eye movements
Female
Head
Head movement
Head Movements - physiology
Hip
Hip Joint - physiopathology
Humans
Kinematics
Male
Medicine
Models, Biological
Neck
Orientation
Postural Balance - physiology
Posture
Posture - physiology
Science programs
Spine
Spine (cervical)
Surgical implants
Tracking
title Functional synergies underlying control of upright posture during changes in head orientation
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