Objective assessment of balance

OData support
Supervisor:
Dr. Jobbágy Ákos Andor
Department of Measurement and Information Systems

First of all, I used the x-IMU to measure balance and its data to create an objective number for balance assessment. This device includes an accelerometer, a magnetometer and a gyroscope and it has got a graphical user interface called GUI. I used the Euler angles (three-dimensional rotations around the three axes) to make a number, that represents balance well. People had to complete five tasks: standing on both feet, standing without breathing, standing with eyes closed, standing on one feet (left, then right). Every measurement takes 20 seconds. I process the data which was recorded by x-IMU with MATLAB.

I had 31 patients and 40 records of them. Based on these, I made conclusions and categories for people: very good, average and bad. I have results of 9 people after six months again, so I can prove that the number I created is stationary.

On the other hand, I dealt with defining stress using a photoplethysmography sensor. To determine HRV (heart rate variability) I used MATLAB software again. Depending on the results I can define stress only when I have a previous record of the patient (measured at rest) too, just like the ground for the analysis.

At the end, I examined the contact between balance and the HRV parameters. I noticed that it is good to measure them together to define the matter of instability. It can happen because of stress or the decadency of coordination.

Downloads

Please sign in to download the files of this thesis.