RESEARCH ARTICLE


The Ecological Dynamics of 1v1 Sub-Phases in Association Football



R. Duarte1, 2, *, D. Araujo2, V. Gazimba1, O. Fernandes1, H. Folgado1, J. Marmeleira1, K. Davids3
1 Department of Sport and Health, University of Évora, Portugal
2 Faculty of Human Kinetics, Technical University of Lisbon, Portugal
3 School of Human Movement Studies, Queensland University of Technology, Australia


Article Metrics

CrossRef Citations:
0
Total Statistics:

Full-Text HTML Views: 419
Abstract HTML Views: 856
PDF Downloads: 480
Total Views/Downloads: 1755
Unique Statistics:

Full-Text HTML Views: 231
Abstract HTML Views: 475
PDF Downloads: 334
Total Views/Downloads: 1040



Creative Commons License
© 2010 Duarte et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Sport and Health, University of Évora, Portugal; Tel: 00351214196777; Fax: 00351214144712; E-mail: rduarte@fmh.utl.pt


Abstract

The purpose of this study was to analyze the informational constraints that influence the dynamics of 1v1 situations in football. Specifically, we analyzed the contribution of interpersonal distance and relative velocity to explain phase transitions that occurred between stable and unstable coordinative states in 1v1 in football. Participants were six, U13 level football players (Mean age: 11.8±0.4 yrs), who performed 5 trials of a representative task at four different start distances (1, 1.5, 2 and 2.5 meters) between the defender and the ball (5 repetitions x 6 players x 4 distances = 120 1v1 trials). Players' motion was captured by digital video camera. For image treatment and to extract data on player movement coordinates, we used the TACTO 8.0 software at 25 Hz. Following, we constructed plots with the time-series of these two control parameters candidates associated with the time-series of players' distance to the end line. Graphical inspection showed in all trials a clear tendency for greater relative velocity and lower interpersonal distance values during phase transitions between coordinative states. To confirm this interpretation, we computed a time-series analysis of Z-scores of relative velocity and interpersonal distance data, and a time-series analysis of Z-score differences between these variables. Mean data showed that maximum peaks in Z-score differences were related to all phase transitions.

Keywords: Ecological dynamics, Interpersonal distance, Relative velocity, Informational constraints.