Dissertation/Thesis Abstract

Closed loop system identification of postural control with bilateral vestibular loss
by Amenabar, Katharine, M.A., University of Maryland, College Park, 2009, 120; 1469651
Abstract (Summary)

Human upright stance can be characterized as a combination of feedback and plant. Feedback consists of integrated sensory signals, producing estimates of position and velocity of the body segments while plant includes both musculotendon dynamics and body dynamics. Separating plant and feedback is possible mathematically through closed loop system identification. By studying bilateral vestibular loss (BVL) patients it is hoped knowledge regarding human posture and the role of the vestibular system will be gained. Two BVL patients and two age, height and gender matched controls had visual and mechanical perturbations applied simultaneously to determine these properties. Both leg and trunk kinematics and EMG data were collected. Using frequency response functions plant and feedback properties were calculated. Plant and feedback dynamics differ. BVL patients show more variable weighted hip EMG data, supporting the idea that this population can not properly use hip movement with their lack of vestibular system.

Indexing (document details)
Advisor: Jeka, John J.
Commitee: Clark, Jane E., Kiemel, Tim
School: University of Maryland, College Park
Department: Kinesiology
School Location: United States -- Maryland
Source: MAI 48/01M, Masters Abstracts International
Subjects: Audiology, Physical therapy
Keywords: Bilateral vestibular loss, Closed loop, Feedback, Plant, Posture
Publication Number: 1469651
ISBN: 978-1-109-39613-3
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