Transition of COM-COP relative phase in a dynamic balance task
- Authors
- Ko, Ji-Hyun; Challis, John H.; Newell, Karl M.
- Issue Date
- Dec-2014
- Publisher
- Elsevier
- Keywords
- Collective variable; Phase transition; Postural control; Self-organization
- Citation
- Human Movement Science, v.38, pp.1 - 14
- Indexed
- SCIE
SSCI
SCOPUS
- Journal Title
- Human Movement Science
- Volume
- 38
- Start Page
- 1
- End Page
- 14
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/25446
- DOI
- 10.1016/j.humov.2014.08.005
- ISSN
- 0167-9457
- Abstract
- The purpose of this study was to investigate whether the coordination between center of mass (COM) and center of pressure (COP) could be a candidate collective variable of a dynamical system that captures the organization of the multi-segmental whole body postural control system. We examined the transition of the COM-COP coordination pattern in a moving platform balance control paradigm. 10 young healthy adults stood on a moving surface of support that within a trial was sinusoidally translated in the anterior-posterior direction continuously scaling up and then down its frequency within the range from 0. Hz to 3.0. Hz. The COP was derived from a single force platform mounted on the moving surface of support. 4 angular joint motions (ankle, knee, hip, and neck) were measured by a 3D motion analysis system that also allowed COM to be derived. The COM-COP coordination changed from in-phase/anti-phase to anti-phase/in-phase at a certain frequency of the support surface, showed hysteresis as a function of the direction of frequency change and higher variability at the transition region. Conversely, the transition of the ankle-hip coordination consistently occurred at 0.3. Hz across subjects with little between or within subject variability as a function of transition frequency and before the COM-COP transition. The findings provide evidence that: (1) the transition of the COM-COP coordination pattern is that of a non-equilibrium phase transition with critical fluctuations and hysteresis; and (2) that COM-COP coupling is a candidate collective variable of the multi-segmental whole body postural control system acting on a redundant postural task. © 2014 Elsevier B.V.
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