Center-of-pressure dynamics of upright standing as a function of sloped surfaces and vision. (15th October 2020)

• Record Type: Journal Article
• Authors: King, Adam C.; Patton, Jacey; Dutt-Mazumder, Aviroop; Newell, Karl M.
• Is Part Of: Neuroscience letters. Volume 737(2020)
• Publication Date: 2020-10-15
• Subjects: Postural control -- Complexity -- Center of pressure -- Time scales -- Entropy; Neurology -- Periodicals; Neurology -- Periodicals; Research -- Periodicals; Neurologie -- Périodiques; Neuroanatomie -- Périodiques; Neuropharmacologie -- Périodiques; Neurophysiologie -- Périodiques; Neurology; Periodicals; Electronic journals; 617.48
• DOI: 10.1016/j.neulet.2020.135334
• Languages: English
• ISSNs: 0304-3940

Abstract

Highlights: Postural control dynamics exhibit adaptability of fractal properties. Vision and support surface angle were used to challenge postural stability. No vision, non-flat (inclined, declined) surfaces increased sway magnitude. Increased COP complexity was found for these same conditions. A lack of interaction effect suggests bounded postural dynamics. Abstract: Upright postural control system exhibits dynamic behavior to produce flexible adaptations to a variety of internal and external perturbations. Understanding the range of postural adaptability in healthy individuals can index the overall state of the system and needs to be defined over various environmental and task constraints. The purpose of the current investigation was to understand the role of vision and support surface angle on the multiple time scales of control that maintain upright posture. Thirteen young, healthy adults performed quiet standing tasks on flat, inclined and declined support surfaces with either eyes open or closed. The variability of the anterior-posterior center of pressure (COP) trajectory was analyzed using linear ( COPlength ) and non-linear (multiscale entropy – MSE) approaches to index postural dynamics. Sway magnitude – COPlength – was greater in both sloped conditions compared to the flat support surface standing and with the removal of vision. Increased irregularity was revealed during the sloped conditions compared to flat surface standing with additional increases of COP complexity when vision was removed. Overall, a similar range of postural adaptability was revealed for both the singular and combined sensory manipulations suggesting limits to the degree of change of COP dynamics.