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Temporal more than spatial regulation of sway is important for posture in response to an ultra-compliant surface.

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Title: Temporal more than spatial regulation of sway is important for posture in response to an ultra-compliant surface.
Authors: Haworth, Joshua L., Strang, Adam J., Hieronymus, Mathias, Walsh, Mark S.
Source: Somatosensory & Motor Research. Mar2018, Vol. 35 Issue 1, p45-51. 7p. 1 Diagram, 1 Chart, 3 Graphs.
Subjects: Lyapunov functions, Nonlinear analysis, Longitudinal method, Spatial ability, Posture
Abstract: Background and aim: Many people use balance training as a rehabilitation or habilitation modality. Although the time course of changes to temporal and spatial aspects of postural sway over the initial weeks of such training is as yet unclear. Particularly, we sought to explore the effects of training on sway during a dynamic task of stance on an ultra-compliant surface. Such a task provides different mechanical, and thus sensorimotor, constraints compared to stance on a solid surface. Methods: Center of pressure (COP) was measured on an ultra-compliant surface atop a force plate at the start of each of 18 days of a 6-week balance training program. Range and standard deviation quantified amount of sway while velocity and Lyapunov exponent (LyE) quantify speed and rhythmicity of sway, respectively. Results: Trend analysis indicated quadratic changes in COP range and standard deviation, with initial reductions followed by returns to initial values by the end of training. Linear reduction of movement velocity and LyE continued through the duration of the program. Reduced LyE indicates regular (self-similar) structure of the COP path. Conclusions: These results provide insight to the developing postural strategy necessary for maintaining upright stance within the dynamics created by interactions with an ultra-compliant surface. Participants showed sensitivity to surface properties, moving both more slowly and with a more regular movement pattern; suggesting that they were able to develop a more feed-forward approach to the maintenance of balance by exploiting task constraints. [ABSTRACT FROM AUTHOR]
Copyright of Somatosensory & Motor Research is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Temporal more than spatial regulation of sway is important for posture in response to an ultra-compliant surface.
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  Data: <searchLink fieldCode="AR" term="%22Haworth%2C+Joshua+L%2E%22">Haworth, Joshua L.</searchLink><br /><searchLink fieldCode="AR" term="%22Strang%2C+Adam+J%2E%22">Strang, Adam J.</searchLink><br /><searchLink fieldCode="AR" term="%22Hieronymus%2C+Mathias%22">Hieronymus, Mathias</searchLink><br /><searchLink fieldCode="AR" term="%22Walsh%2C+Mark+S%2E%22">Walsh, Mark S.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Somatosensory+%26+Motor+Research%22">Somatosensory & Motor Research</searchLink>. Mar2018, Vol. 35 Issue 1, p45-51. 7p. 1 Diagram, 1 Chart, 3 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Lyapunov+functions%22">Lyapunov functions</searchLink><br /><searchLink fieldCode="DE" term="%22Nonlinear+analysis%22">Nonlinear analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Longitudinal+method%22">Longitudinal method</searchLink><br /><searchLink fieldCode="DE" term="%22Spatial+ability%22">Spatial ability</searchLink><br /><searchLink fieldCode="DE" term="%22Posture%22">Posture</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: <bold>Background and aim:</bold> Many people use balance training as a rehabilitation or habilitation modality. Although the time course of changes to temporal and spatial aspects of postural sway over the initial weeks of such training is as yet unclear. Particularly, we sought to explore the effects of training on sway during a dynamic task of stance on an ultra-compliant surface. Such a task provides different mechanical, and thus sensorimotor, constraints compared to stance on a solid surface. <bold>Methods:</bold> Center of pressure (COP) was measured on an ultra-compliant surface atop a force plate at the start of each of 18 days of a 6-week balance training program. Range and standard deviation quantified amount of sway while velocity and Lyapunov exponent (LyE) quantify speed and rhythmicity of sway, respectively. <bold>Results:</bold> Trend analysis indicated quadratic changes in COP range and standard deviation, with initial reductions followed by returns to initial values by the end of training. Linear reduction of movement velocity and LyE continued through the duration of the program. Reduced LyE indicates regular (self-similar) structure of the COP path. <bold>Conclusions:</bold> These results provide insight to the developing postural strategy necessary for maintaining upright stance within the dynamics created by interactions with an ultra-compliant surface. Participants showed sensitivity to surface properties, moving both more slowly and with a more regular movement pattern; suggesting that they were able to develop a more feed-forward approach to the maintenance of balance by exploiting task constraints. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Somatosensory & Motor Research is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1080/08990220.2018.1445988
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              Text: Mar2018
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