Maintenance of postural stability as a function of tilted base of support

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• 作者：Aviroop Dutt-Mazumder^a ; ^{duttamaz@musc.edu" class="auth_mail" title="E-mail the corresponding author} ; John Challis^b ; Karl Newell^c
• 关键词：Multi-joint coordination ; Postural control ; Degrees of freedom ; Spectral analysis ; Tilted support surface
• 刊名：Human Movement Science
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：48
• 期：Complete
• 页码：91-101
• 全文大小：2409 K

文摘

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.