Publicação
The influence of the "stutter-step" on the penalty taker-goalkeeper dynamics in association football
| Resumo: | Penalty kicks has been investigated by unrepresentative designs (i.e., video analysis and computer simulations) with goalkeepers decisional behavior associated to abilities of predict ball direction. Grounded by a representative and ecological dynamic approach this research aimed to investigate the effects of the stutter-step misleading skill on the penalty taker-goalkeeper system. Five penalty takers and two goalkeepers U20 of Brazilian first division performed twenty-two penalties in-situ and under official rules. Through two conditions for penalty takers (i.e., free and stutter-step) players’ motion was captured and digitized. The space-time coordination revealed a coupling attractor of 30º of phase in free condition and a more unstable pattern in the stutter-step condition (i.e., 30º, 60 º and 90º of phase). Goalkeepers were attuned to a fast-increase-followedby-decrease pattern on the approaching speed of penalty takers, however run-up may be a nonspecified variable to goalie decision. It was identified that players prospectively controlled their actions by exchanging information and that both players must to act in order to unfold events that specifies successful decision making. It is concluded that the last second before foot-to-ball contact is critical to perturbations and pickup of relevant information, and also that goalkeepers are vulnerable to the effects of the stutter-step. |
|---|---|
| Autores principais: | Rosa, Cristina Fonseca |
| Assunto: | Approaching run Decision making Dynamic systems Ecological dynamic Football association Goalkeeper Misleading skills Penalty kick Penalty taker Corrida de aproximação Dinâmica ecológica Futebol Grande penalidad3e Guarda redes Habilidades enganosas Paradinha Rematador Sistemas dinâmicos Tomada de decisão |
| Ano: | 2011 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | Penalty kicks has been investigated by unrepresentative designs (i.e., video analysis and computer simulations) with goalkeepers decisional behavior associated to abilities of predict ball direction. Grounded by a representative and ecological dynamic approach this research aimed to investigate the effects of the stutter-step misleading skill on the penalty taker-goalkeeper system. Five penalty takers and two goalkeepers U20 of Brazilian first division performed twenty-two penalties in-situ and under official rules. Through two conditions for penalty takers (i.e., free and stutter-step) players’ motion was captured and digitized. The space-time coordination revealed a coupling attractor of 30º of phase in free condition and a more unstable pattern in the stutter-step condition (i.e., 30º, 60 º and 90º of phase). Goalkeepers were attuned to a fast-increase-followedby-decrease pattern on the approaching speed of penalty takers, however run-up may be a nonspecified variable to goalie decision. It was identified that players prospectively controlled their actions by exchanging information and that both players must to act in order to unfold events that specifies successful decision making. It is concluded that the last second before foot-to-ball contact is critical to perturbations and pickup of relevant information, and also that goalkeepers are vulnerable to the effects of the stutter-step. |
|---|