Organization of Compensatory Postural Coordination Patterns

The authors investigated whether compensatory postural coordination patterns are organized according to the same dynamical principles as are nonequilibrium phase transitions. Eight participants were asked to maintain upright balance on a moving platform that was sinusoidally translated in the anteri...

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Bibliographic Details
Published in:Journal of motor behavior 2003-12, Vol.35 (4), p.325-342
Main Authors: Ko, Young-Gyu, Challis, John H., Stitt, Joseph P., Newell, Karl M.
Format: Article
Language:English
Subjects:
Adult
Anatomy
Biological and medical sciences
Biomechanical Phenomena
Body Mass Index
compensatory postural coordination
Coordination
degrees of freedom
Exhibits
Fourier Analysis
Freedom
Fundamental and applied biological sciences. Psychology
Gravitation
Humans
Joints - physiology
Kinesthesis - physiology
Male
Mathematical Computing
Orientation - physiology
Postural Balance - physiology
Reference Values
self-organization
Signal Processing, Computer-Assisted
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
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Summary:The authors investigated whether compensatory postural coordination patterns are organized according to the same dynamical principles as are nonequilibrium phase transitions. Eight participants were asked to maintain upright balance on a moving platform that was sinusoidally translated in the anterior-posterior direction and was systematically increased and decreased 0.19 Hz as a step function every 10 platform cycles through the frequency range 0.19-1.46 Hz. At low platform frequencies, all participants exhibited small joint angular motions with high variability, and the relative phase between the joint motions exhibited drifting patterns and large fluctuations. As platform frequency increased, the amplitude of joint motion increased systematically and joint-specific oscillatory patterns emerged. The findings provided no evidence for a Hopf bifurcation or hysteresis in the transitions of postural coordination modes, however, or, mote generally, a basis for distinguishing the relevance of linear versus nonlinear models of postural control.
ISSN:0022-2895
1940-1027
DOI:10.1080/00222890309603154