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mrj 2016, 9 - : 178-186 Back to browse issues page
Evaluation of fractal dimension analysis capability in distinguishing elite Wushu athletes with respect to difference in postural stability
Reza Saber 1, Mostafa Rostami2, Ali Tanbakoosaz3, Ali Ramezani4, Afsaneh Dadarkhah5
1- MSc of Biomedical Engineering (Biomechanics), Amirkabir University of Technology (Tehran Polytechnic) , reza.saber@aut.ac.ir
2- Associate Professor, Biomechanics Division, Biomedical Engineering Faculty, Amirkabir University of Technology (Tehran Polytechnic).
3- Assistant Professor, Biomechanics Division, Mechanical Engineering Faculty, Isalamic Azad Univerity (Abhar)
4- MSc of Biomedical Engineering (Biomechanics), Amirkabir University of Technology (Tehran Polytechnic)
5- MSc of Physiotherapy, Faculty Member of AJA University of Medical Sciences.
Abstract:   (1584 Views)

Background and Aim: Fractal dimension (FD) as a measure of system complexity and a chaos and nonlinear dynamics tool has appeared successful in distinguishing subjects with different specifications such as proficiency level. The purpose of this research was to evaluate the capability of FD analysis of postural stability in distinguishing elite Wushu sportsman for dispatching to various competitions.

Materials and Methods: Eight elite and eight non-elite Wushu sportsmen from Talou section participated in this research and performed a difficult balance motion called “backward balance”. Center of pressure (COP) traces were recorded and Higuchi algorithm has been used to obtain fractal dimension of COP displacement time series. Average of FD of two groups were compared with an unpaired t-test.

Results: In both directions of anterio-posterior (AP) and medio-lateral (ML), average values of FD in elite group were significantly more than non-elite group (p<0.05). Subsequently, implementing a receiver operating characteristic (ROC) analysis indicated that FD analysis method performance is very good in AP direction (Area under the curve or AUC=0.938) and good enough in ML direction (AUC=0.668).

Conclusions: Postural control system acts more complex in elite group because of their more proficiency. FD analysis of COP time series could help coaches in choosing elite Wushu sportsman even among a group of skilled Wushu sportsmen. 

Keywords: Wushu, Postural stability, Fractal dimension, Receiver operating characteristic (ROC), Center of pressure (COP)

Keywords: Wushu, Postural stability, Fractal dimension, Receiver operating characteristic (ROC), Center of pressure (COP)
Full-Text [PDF 187 kb]   (537 Downloads)    
Type of Study: Research | Subject: Special
Received: 2016/02/16 | Accepted: 2016/02/16 | Published: 2016/02/16
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Saber R, Rostami M, Tanbakoosaz A, Ramezani A, Dadarkhah A. Evaluation of fractal dimension analysis capability in distinguishing elite Wushu athletes with respect to difference in postural stability . mrj. 2016; 9 (S1) :178-186
URL: http://mrj.tums.ac.ir/article-1-5414-en.html
Volume 9 - Back to browse issues page
فصلنامه توانبخشی نوین Journal of Modern Rehabilitation
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