Sensitivity of Body Sway Parameters During Quiet Standing to Manipulation of Support Surface Size

Overview

Journal J Sports Sci Med

Specialty Orthopedics

Date 2013 Oct 24

PMID 24149637

Citations 17

Authors

Sarabon Nejc

Rosker Jernej

Stefan Loefler

Helmut Kern

Affiliations

Soon will be listed here.

Abstract

The centre of pressure (COP) movement during stance maintenance on a stable surface is commonly used to describe and evaluate static balance. The aim of our study was to test sensitivity of individual COP parameters to different stance positions which were used to address size specific changes in the support surface. Twenty-nine subjects participated in the study. They carried out three 60-second repetitions of each of the five balance tasks (parallel stance, semi-tandem stance, tandem stance, contra-tandem stance, single leg stance). Using the force plate, the monitored parameters included the total COP distance, the distance covered in antero-posterior and medio-lateral directions, the maximum oscillation amplitude in antero-posterior and medio-lateral directions, the total frequency of oscillation, as well as the frequency of oscillation in antero-posterior and medio-lateral directions. The parameters which describe the total COP distance were the most sensitive to changes in the balance task, whereas the frequency of oscillation proved to be sensitive to a slightly lesser extent. Reductions in the support surface size in each of the directions resulted in proportional changes of antero-posterior and medio- lateral directions. The frequency of oscillation did not increase evenly with the increase in the level of difficulty of the balance task, but reached a certain value, above which it did not increase. Our study revealed the monitored parameters of the COP to be sensitive to the support surface size manipulations. The results of the study provide an important source for clinical and research use of the body sway measurements. Key pointsTesting static balance with body sway related center of pressure (COP) parameters;Testing sensitivity of COP sub-components to manipulations of the stance position;Analytical approach to the study of COP parameters that enable the insight to the frequency/amplitude and direction-dependency relationships;Adding to the basic knowledge of static balance which can be applied to testing and training routines.

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