Date of Award

Spring 1993

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)


Biomedical Engineering

First Advisor

Harris, Gerald F.

Second Advisor

Myckleburt, Joel

Third Advisor

Riedel, Susan A.


A quantitative investigation of postural stability is been made for past several years. There are many different factors which affect stability of the human body such as visual feedback, the height and weight of the body, the joints, muscles, and the continued activities inside the body itself. The way these factors effect the steadiness of the human posture is not well defined nor completely understood. Due to its importance in the research field, have resulted in several measurement devices and thousands of reports. The study presented here provides a quantitative study of postural stability in ten normal adults. This study also presents the frequency aspects of the sway and signal stationarity. Chapter I is an introduction to postural stability and a brief description of the objectives behind this project. Chapter II contains a review of the previous work done in the are of postural stability. Chapter III describes the components of the force platform. It also explains the testing methods including the calibration of the system, the testing protocol, and the tested patients. Chapter IV includes the data analysis and the results. Chapter V includes the discussion of the overall results. Appendix A includes computer programs used to acquire and analyze the data to find the X and Y component of the center of pressure, X and Y rootmean- squares, pathlength, radius, sway area, and performing the run test for signal stationarity.