Effects of aging in postural strategies during a seated auto-stabilization task |
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Authors: | Noémie C. Duclos Luc Maynard Djawad Abbas Serge Mesure |
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Affiliation: | 1. Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille cedex 09, France;2. CRF Valmante, Ugecam-PACA, 13275 Marseille cedex 09, France |
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Abstract: | Impaired sensory, motor and central processing systems combining with biomechanical changes are risk of fall factors in the elderly population. The aim of this study was to assess the auto-adaptation and the regulation of the dynamic control of equilibrium in age-related adaptive strategies, by using a seated position on a seesaw. 15 young adults and 12 healthy middle-aged adults were asked to actively maintain a sitting posture as stable as possible during 12.8 s, on a 1-degree of freedom seesaw (auto-stabilization paradigm), with and without vision. The seesaw was placed in order to allow roll or pitch oscillations. We determine length and surfaces CoP shifts, mean positions and variability, a Postural Performance Index (PI) and a Strategy Organization Ratio (SOR). Our results shows that adopted strategies are plane-dependant during auto-stabilization (parallel and perpendicular axes control is impacted) and age-dependant. PIx during roll seated auto-stabilization tasks appears as the most relevant parameter of aged-related instability. The visual effect, during pitch auto-stabilization, characterizes the postural sensory-motor human behavior. The quantitative and qualitative postural assessment, thanks to seated auto-stabilization task, need to be promoted for long-term health care and probably for the rehabilitation of various disorders. |
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Keywords: | Postural control Aging Auto-stabilization Balance impairment Destabilization plans |
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