Generalizability of Center of Pressure Measurements Across Age Populations
Doyle, Richard John
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https://hdl.handle.net/2142/86397
Description
Title
Generalizability of Center of Pressure Measurements Across Age Populations
Author(s)
Doyle, Richard John
Issue Date
2008
Doctoral Committee Chair(s)
Karl Rosengren
Elizabeth Hsiao-Wecksler
Department of Study
Kinesiology and Community Health
Discipline
Kinesiology and Community Health
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Health Sciences, Recreation
Language
eng
Abstract
The reliability of common Center of Pressure (COP) measurements was systematically investigated. Studies on the control of posture during quiet standing using force platform data lack standardization in measurement protocols (especially trial length and number). Guidelines for methodology that met acceptable reliability levels were established in both normal and altered visual conditions (Studies 1 and 2) and across multiple age populations (Study 3). The tools of Generalizability Theory (G-Theory) were used to thoroughly examine the reliability of both summary and time-varying measurements of COP. G-Theory is a powerful reliability analysis tool that permits the systematic inspection of identified components of variance (i.e. length of trial and number of trials) and subsequently provides feedback on establishing protocols meeting acceptable levels of reliability. The results of all three studies indicate that, when investigating quiet standing using COP measurements from a force platform, a minimum of 5 trials should be completed at 60 seconds in length. Most measurements included in these studies reached acceptable levels of reliability at or before this point. Reliability is a critical component of research design and the guidelines established in these studies can be used when designing future studies.
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