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Articles 61 - 65 of 65

Full-Text Articles in Physical Therapy

Visual Contributions To The Vestibulo-Ocular Reflex During Balance Recovery Tasks, Mark D. Diehl Jan 2007

Visual Contributions To The Vestibulo-Ocular Reflex During Balance Recovery Tasks, Mark D. Diehl

Theses and Dissertations

Introduction: The Vestibulo-ocular reflex (VOR) is quantified by computing the ratio of head angular velocity and eye angular velocity (VOR Gain). This measure only includes head angular movements; linear translations are not accounted for. These investigations postulate an alternative method of VOR quantification, one that assesses retinal image stability during head angular and linear movements (Foveal fixation (FF)). This method was used to assess the role of vision in balance reactions. Methods: Experiment 1 : Ten Young subjects were fitted with an eye tracker linked to an EM kinematic recording system. This allowed for the recording of head, trunk and …

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Functional Ankle Instability Does Not Effect The Average Center Of Pressure Position In The Coronal Plane, Jessica A. Presnell Dec 2006

Functional Ankle Instability Does Not Effect The Average Center Of Pressure Position In The Coronal Plane, Jessica A. Presnell

All-Inclusive List of Electronic Theses and Dissertations

Context: It is not known if functionally unstable ankles have a different medial to lateral center of pressure placement compared to the contralateral uninjured limb. Objective: To compare the average medial/lateral position of the center of pressure, from the midline of the foot, in functionally unstable ankles to the contralateral uninjured ankle. Design: A 1 X 2 within subject design guided this study. The independent variable was ankle health (functional ankle instability or uninjured). Setting: Laboratory. Patients or Other Participants: Twenty-six, physically-active, volunteers who suffer from unilateral functional ankle instability (F AI) [M: 10 F: 16 age: 21±2.1 y ht: …

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Use Of Item Response Analysis To Investigate Measurement Properties And Clinical Validity Of Data For The Dynamic Gait Index, Yi-Po Chiu, Stacy L. Fritz, Kathye E. Light, Craig A. Velozo Jun 2006

Use Of Item Response Analysis To Investigate Measurement Properties And Clinical Validity Of Data For The Dynamic Gait Index, Yi-Po Chiu, Stacy L. Fritz, Kathye E. Light, Craig A. Velozo

Physical Therapy Faculty Research

Background and Purpose. The Dynamic Gait Index (DGI) is a standardized clinical assessment that aids in evaluating a subject’s ability to modify gait in response to changing demands. The purpose of this study was to use Rasch measurement theory to examine whether the DGI rating scale meets suggested psychometric guidelines, whether the hierarchical order of DGI tasks is consistent with a clinically logical testing procedure, and whether the DGI represents a unidimensional construct. Subjects. Subjects were 84 community-dwelling male veterans (age range=64–88 years; mean±SD=75±6.47 years). Methods. Data were retrieved retrospectively from the participants’ clinical records. The Rasch measurement model with …

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A Comparison Of Hip Versus Ankle Exercises In Elders And The Influence On Balance And Gait, Laura Z. Gras, Pamela Levangie, Mary (Tina) Goodwin-Segal, Deborah A. Lawrence May 2004

A Comparison Of Hip Versus Ankle Exercises In Elders And The Influence On Balance And Gait, Laura Z. Gras, Pamela Levangie, Mary (Tina) Goodwin-Segal, Deborah A. Lawrence

All PTHMS Faculty Publications

Purpose: Reductions in hip and ankle strength and range of motion (ROM) in elderly subjects have been associated with decreased functional mobility and risk of falls. The purpose of this research was to determine if short duration hip or ankle interventions designed to increase ROM and strength could improve ROM and strength of those joints, as well as improve balance and gait outcomes. Methods: Well elderly volunteers recruited from retirement communities and a senior citizen center were randomly assigned to a hip or ankle intervention group. Both groups performed a home exercise program (HEP) of stretching 5 days a week …

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Whole Body Momentum During Gait: A Preliminary Study Of Non-Fallers And Frequent Fallers, Guy G. Simoneau, David E. Krebs Jan 2000

Whole Body Momentum During Gait: A Preliminary Study Of Non-Fallers And Frequent Fallers, Guy G. Simoneau, David E. Krebs

Physical Therapy Faculty Research and Publications

The importance of momentum in compensating for elderly individua ls ' strength deficits to achieve activities of daily living. such as rising from a chair ha.!o been demonstrated in earlier studies. Here we present a case control study of three healthy "non-fallers" and two "frequent fallers," All 5 elders were community-living and were tested in the gai l laboratory. A four-camera Selspot system was used to obtain whole-body momentum from an 11-segment kinematic model. Ground reaction forces and kinematics were used 10 calculate lower extremity join! moments. With the exception of the whole-body's angular momentum about the vertical axis, linear …

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