Marco Dozza - PhD in Bioengineering, 2003-2007

Biofeedback Systems for Postural Control

ACRM-ASNR joint Conference, 28 September · 2 October 2005 - Chicago (IL), USA

• F.B. Horak, M. Dozza , and L. Chiari, “Audio-biofeedback of trunk sway compensates for lack of vestibular, somatosensory, or visual information”, Proc. ACRM-ASNR joint Conference, Chicago (IL), USA, 28 September - 2 October 2005.



Abstract - Objective: To evaluate the effect of providing additional trunk sway information using an audio biofeedback (ABF) device in patients with bilateral vestibular loss (BVL) and in healthy subjects. Design: Before-after trial. Setting: University Balance Disorders Laboratory. Participants: 9 individuals with BVL and 9 healthy individuals. Interventions: ABF of trunk sway while standing in different condition of limited/inadequate sensory information (as keeping eyes closed and/or standing on foam). Main Outcome Measure: Balance stability was evaluated according to the following parameters: the root mean square of (1) the center of pressure displacements and of (2) the trunk accelerations. Results: Participants with BVL had significantly larger postural sway than did healthy participants. The less sensory information was available the larger was postural sway for all participants. ABF decreased postural sway for both BVL and healthy participants in all conditions tested. The more severe was the vestibular deficit the more ABF was effective in reducing BVL participants’ sway. The less sensory information was available the more ABF reduced sway for all participants. Conclusion: Balance stability decreases when balance information from vestibular, somatosensory or visual sense is limited or inadequate. ABF information increases balance stability proportionally to the lack of generic balance information.

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