Maintenance of postural stability as a function of tilted base of support |
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| Affiliation: | 1. College of Health Professions, Medical University of South Carolina, 77, President Street, MSC 700, Charleston, SC, 29425, United States;2. Department of Kinesiology, The Pennsylvania State University, United States;3. Department of Kinesiology, University of Georgia, United States;1. Department of Magnetic Resonance Imaging, Cardiovascular Imaging and Intervention Center, Fuwai Hospital, State Key Laboratory of Cardiovascular Disease, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China;2. Department of Radiology, Air Force General Hospital, People''s Liberation Army, Beijing, China;3. National Heart, Lung and Blood Institute (NHLBI), National Institutes of Health (NIH), Bethesda, MD, USA;4. Cardiovascular and Pulmonary Branch, National Heart, Lung and Blood Institute, National Institutes of Health, US Department of Health and Human Services, Bethesda, USA;1. University of Primorska, Andrej Marusic Institute, Koper, Slovenia;2. S2P Ltd., Laboratory for Motor Control and Motor Learning, Ljubljana, Slovenia;1. Land Division, Defence Science and Technology Group, Australia;2. Centre for Human and Applied Physiology, School of Medicine, University of Wollongong, Wollongong, NSW, Australia |
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| Abstract: | The experiment was set-up to investigate the mechanisms of postural control by manipulating the base of support angle, using tilted platform wedges. The primary focus was to analyze the coupling of the motion of the center of mass (CoM) and the center of pressure (CoP), and the motions of the leg joints considered as individual components and synergies. The CoM-CoP coupling (both medio-lateral and anterioposterior) was preserved (∼0°) across all tilted platform angles (35°, 30°, 20°, 10° Down, 0° Flat and 10°, 20°, 25° Up), reflecting an in-phase pattern. There was high coherence (∼1) for CoM-CoP in the lower frequency range, whereas contrarily the hip, knee and ankle pair-wise couplings had values ranging between (0.4 and 0.7) across the different platform angle conditions. These findings are consistent with the view that the local pair-wise coupled variables of Hip, Knee and Ankle motions adaptively self-organized to preserve the CoM-CoP in-phase coupling at equilibrium over the baseline (0° Flat) platform condition and all other tilted platform angles. The findings support the hypothesis of CoM-CoP coupling acting as a collective variable that provides the structural integrity of the system for upright quiet standing across the platform angle conditions. |
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| Keywords: | Multi-joint coordination Postural control Degrees of freedom Spectral analysis Tilted support surface |
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