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Quantification of Trunk Postural Stability Using Convex Polyhedron of the Time-Series Accelerometer Data


Affiliations
1 Czech Technical University in Prague, 272 01 Kladno, Czech Republic
2 Department of Rehabilitation and Spa Medicine, P. J. Safarik University in Kosice, 040 01 Kosice, Slovakia
3 Palacky University of Olomouc, 771 11 Olomouc, Czech Republic
 

Techniques to quantify postural stability usually rely on the evaluation of only two variables, that is, two coordinates of COP. However, by using three variables, that is, three components of acceleration vector, it is possible to describe human movement more precisely. For this purpose, a single three-axis accelerometer was used, making it possible to evaluate 3D movement by use of a novel method, convex polyhedron (CP), together with a traditional method, based on area of the confidence ellipse (ACE). Ten patients (Pts) with cerebellar ataxia and eleven healthy individuals of control group (CG) participated in the study.The results show a significant increase of volume of the CP (CPV) in Pts or CG standing on foam surface with eyes open (EO) and eyes closed (EC) after the EC phase. Significant difference between Pts and CG was found in all cases as well. Correlation coefficient indicates strong correlation between the CPV and ACE in most cases of patient examinations, thus confirming the possibility of quantification of postural instability by the introduced method of CPV.
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  • Quantification of Trunk Postural Stability Using Convex Polyhedron of the Time-Series Accelerometer Data

Abstract Views: 49  |  PDF Views: 0

Authors

Roman Melecky
Czech Technical University in Prague, 272 01 Kladno, Czech Republic
Vladimir Socha
Czech Technical University in Prague, 272 01 Kladno, Czech Republic
Patrik Kutilek
Czech Technical University in Prague, 272 01 Kladno, Czech Republic
Lenka Hanakova
Czech Technical University in Prague, 272 01 Kladno, Czech Republic
Peter Takac
Department of Rehabilitation and Spa Medicine, P. J. Safarik University in Kosice, 040 01 Kosice, Slovakia
Jakub Schlenker
Czech Technical University in Prague, 272 01 Kladno, Czech Republic
Zdenek Svoboda
Palacky University of Olomouc, 771 11 Olomouc, Czech Republic

Abstract


Techniques to quantify postural stability usually rely on the evaluation of only two variables, that is, two coordinates of COP. However, by using three variables, that is, three components of acceleration vector, it is possible to describe human movement more precisely. For this purpose, a single three-axis accelerometer was used, making it possible to evaluate 3D movement by use of a novel method, convex polyhedron (CP), together with a traditional method, based on area of the confidence ellipse (ACE). Ten patients (Pts) with cerebellar ataxia and eleven healthy individuals of control group (CG) participated in the study.The results show a significant increase of volume of the CP (CPV) in Pts or CG standing on foam surface with eyes open (EO) and eyes closed (EC) after the EC phase. Significant difference between Pts and CG was found in all cases as well. Correlation coefficient indicates strong correlation between the CPV and ACE in most cases of patient examinations, thus confirming the possibility of quantification of postural instability by the introduced method of CPV.