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ANALYSIS OF THE DISTANCES COVERED BY FIRST DIVISION BRAZILIAN SOCCER
PLAYERS OBTAINED WITH AN AUTOMATIC TRACKING METHOD
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Ricardo
M. L. Barros1 ,
Milton S. Misuta1, Rafael P. Menezes1, Pascual J. Figueroa2, Felipe
A. Moura3, Sergio A Cunha3, Ricardo Anido2 and Neucimar J. Leite2 |
1Laboratory of Instrumentation for Biomechanics, College of Physical
Education, Campinas State University, Campinas, Brazil, 2Institute of Computing,
Campinas State University, Campinas, Brazil, 3Laboratory of Biomechanical
Analysis, Department of Physical Education, Paulista State University, Departamento
de Educação Física, Universidade Estadual Paulista, Rio Claro, Brazil.
| Received |
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20 November 2006 |
| Accepted |
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07
March 2007 |
| Published |
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01
June 2007 |
©
Journal of Sports Science and Medicine (2007) 6, 233 - 242
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| ABSTRACT |
| Methods
based on visual estimation still is the most widely used analysis
of the distances that is covered by soccer players during matches,
and most description available in the literature were obtained using
such an approach. Recently, systems based on computer vision techniques
have appeared and the very first results are available for comparisons.
The aim of the present study was to analyse the distances covered
by Brazilian soccer players and compare the results to the European
players', both data measured by automatic tracking system. Four regular
Brazilian First Division Championship matches between different teams
were filmed. Applying a previously developed automatic tracking system
(DVideo, Campinas, Brazil), the results of 55 outline players participated
in the whole game (n = 55) are presented. The results of mean distances
covered, standard deviations (s) and coefficient of variation (cv)
after 90 minutes were 10,012 m, s = 1,024 m and cv = 10.2%, respectively.
The results of three-way ANOVA according to playing positions, showed
that the distances covered by external defender (10642 ± 663 m), central
midfielders (10476 ± 702 m) and external midfielders (10598 ± 890
m) were greater than forwards (9612 ± 772 m) and forwards covered
greater distances than central defenders (9029 ± 860 m). The greater
distances were covered in standing, walking, or jogging, 5537 ± 263
m, followed by moderate-speed running, 1731 ± 399 m; low speed running,
1615 ± 351 m; high-speed running, 691 ± 190 m and sprinting, 437 ±
171 m. Mean distance covered in the first half was 5,173 m (s = 394
m, cv = 7.6%) highly significant greater (p < 0.001) than the mean
value 4,808 m (s = 375 m, cv = 7.8%) in the second half. A minute-by-minute
analysis revealed that after eight minutes of the second half, player
performance has already decreased and this reduction is maintained
throughout the second half.
KEY
WORDS: Biomechanics, soccer, distance covered, tracking.
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