# Evaluation of measurement reliability for selected indices of postural stability based on data from the GYKO Inertial Sensor System

## TL;DR

This study assesses the reliability of postural stability measurements using the GYKO inertial sensor system in healthy students.

## Contribution

The study provides empirical evidence on the reproducibility of postural stability indices using an inertial sensor system.

## Key findings

- The ICC values for postural stability variables ranged from 0.31 to 0.75, with some showing good reliability.
- Four variables had ICC values around 0.7, indicating good reliability.
- The GYKO system is shown to be a cost-effective alternative to force balance platforms for postural stability measurements.

## Abstract

The main aim of this study is to use comprehensive statistical analyses to evaluate measurement reliability of selected variables that characterize postural stability. The study examined twenty-nine healthy non-athlete students. The examinations were performed twice, with a one-week interval. The Microgate GYKO inertial sensor system was used to evaluate the reliability of variables that characterize postural stability. The relative reliability of the repeated test was evaluated using the intraclass correlation coefficient (ICC) with 95% confidence interval (95% CI). Next, the standard error of measurement (SEM) and minimal detectable change (MDC) were computed. Relative reliability of the repeated test for all analysed variables of ICC ranged from 0.31 to 0.75. For four variables, ICC values were ca. 0.7, i.e., they can be considered as good. For four other variables, ICC ranged from 0.41 to 0.54, with these values considered fair. Satisfactory reproducibility of postural stability measurements using the GYKO inertial sensor system demonstrates that it can offer an inexpensive and efficient alternative to measurements that use force balance platforms.