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1 Biomechanics and Movement Sciences, University of Delaware, Newark, Delaware, United States
2 Physical Therapy, University of Delaware, Newark, Delaware, United States; Biomechanics and Movement Sciences, University of Delaware, Newark, Delaware, United States
3 Institut für Neuroinformatik, Ruhr-Universität Bochum, Bochum, Germany
4 Kinesiology, University of Maryland, College Park, Maryland, United States
5 Kinesiology, Universiity of Maryland, College Park, Maryland, United States
* To whom correspondence should be addressed. E-mail: jpscholz{at}udel.edu.
This study tested the hypotheses that all major joints along the longitudinal axis of the body are equally active during quiet standing and that their motions are coordinated to stabilize the spatial positions of the center of mass (CM) and head. Analyses of the effect of joint configuration variance on the stability of the CM and head positions were performed using the Uncontrolled Manifold (UCM) approach. Subjects stood quietly with arms folded across their chests for three five-minute trials each with and without vision. The UCM analysis revealed that the six joints examined were coordinated such that their combined variance had minimal effect on the CM and head positions. Removing vision led to a structuring of the resulting increased joint variance such that little of the increase affected stability of the CM and head positions. The results reveal a control strategy involving coordinated variations of most major joints to stabilize variables important to postural control during quiet stance.
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