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- W178533738 abstract "Introduction: Spectral analysis of the center of pressure (CP) signal has shown changes in different aspects of the control of balance in situations of altered sensory inflow. For instance, variations in the power spectral density (PSD) profile might indicate changes in short or long-term mechanisms of postural control. The present work investigated if changes in PSD profile found in upright and kneeling positions are due to alterations in postural strategies or are merely due to biomechanical factors. To reach this goal, besides the experimental approach, a biomechanical model was used to simulate postural sway in both upright and kneeling conditions.Methods: Eight normal male adults remained during 60 seconds over a force platform in upright or kneeling stances. A simple feedback-based biomechanical model in which the human body is represented by a single-link inverted pendulum was used. The neural controller was a standard PID (proportional/integrative/derivative) model. Sway patterns that resemble spontaneous sway obtained experimentally in both upright and kneeling (decreasing about 33% the height of the pendulum) conditions were generated. The PSDs of the CP signals (from both experiments and simulations) were estimated by the Welch method.Results: The spectra obtained in both experiments and simulations, regardless of condition, were similar. The PSD obtained in the kneeling condition showed a substantial decrease in frequencies below 0.3Hz compared to upright stance. On the other hand, there was a slight increase in the power at frequencies above 0.6Hz. Discussion: The present results suggest that the observed spectral changes of the CP signals obtained from kneeling stance are mainly caused by biomechanical factors and not by alterations in some strategy or mechanism of postural control. Therefore, the central nervous system uses similar dynamics (or a similar ?strategy?) irrespective of the joint/muscles involved in the stabilization of body. In spite of the simplicity of the biomechanical model (which uses only ankle joint angle as a feedback), the present work opens the possibility for further investigations through a more refined model that could incorporate vision and additional biomechanical elements (e.g., joint stiffness)." @default.
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- W178533738 date "2007-08-09" @default.
- W178533738 modified "2023-10-05" @default.
- W178533738 title "COMPARISON OF SWAY DURING KNEELING AND DURING STANDING: A SPECTRAL ANALYSIS" @default.
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