The tackle in Rugby Union : understanding training and match behaviours to develop better coaching strategies for skill acquisition, performance, and injury prevention

Includes abstract.~Includes bibliographical references.Rugby Union is a popular international team sport characterised by frequent high impact bodily collisions known as the tackle. This aspect of the game exposes players to muscle damage and a high risk of injury. Tackle-related injuries account for up to 61% of all injuries during a rugby match. Furthermore, players’ ability to win the tackle contest has an influence on the outcome of the match. Given the nature and frequency of the tackle situation, tackle contact skills are a prerequisite for participation in rugby union. However, coaching and training drills prescribed to train the tackle to date are largely based on anecdotal evidence. To develop effective tackle training strategies (i.e. technical skills training, physical conditioning, training drills, and equipment) that will produce a successful outcome and reduce the risk of injury for both the ball-carrier and tackler, studying the tackle in real match situations is warranted. Therefore, in accordance with this goal the purpose of this thesis was to; (i) assess the current attitudes and behaviours of players during training and match play, and (ii) study the tackle and defensive strategies in real match situations

Assessing decision-making in elite academy footballers using real-world video clips

The aim of this experiment was to investigate whether there were differences in decision-making skills between different age groups (Under 16, 18 and 23) of elite academy footballers on a video-based task of real-life football scenarios. It also explored the relationship between individual performance on the task and the performance of the footballers on the pitch, as rated by three independent expert football coaches. This allowed us to examine whether this task is useful in predicting real-world decision-making skills. The results show that there was a significant difference in response times between response time was statistically significantly lower in U23 compared to U18 and U16 and there was no statistically significant difference between the U16 and the U18 groups, but no significant difference between age groups on the accuracy of response. The under 23 age group responded significantly quicker when compared to the under 18 and under 16 age group most quickly, then the U18, and finally, U16 footballers were the slowest on the task. In terms of comparing coaches' opinion about the players' decision-making skills and players performance on the task, there was a positive correlation between accuracy on the task and general decision-making skills rated by the coaches, suggesting that coaches have a good insight on what players can actually do as. However, coaches ratings of decision-making skills and response times on the task did not correlate suggesting that coaches are not aware of the speed of decision-making, and that this is only measurable by a representative task

Detecting Deception in Movement: The Case of the Side-Step in Rugby

Although coordinated patterns of body movement can be used to communicate action intention, they can also be used to deceive. Often known as deceptive movements, these unpredictable patterns of body movement can give a competitive advantage to an attacker when trying to outwit a defender. In this particular study, we immersed novice and expert rugby players in an interactive virtual rugby environment to understand how the dynamics of deceptive body movement influence a defending player’s decisions about how and when to act. When asked to judge final running direction, expert players who were found to tune into prospective tau-based information specified in the dynamics of ‘honest’ movement signals (Centre of Mass), performed significantly better than novices who tuned into the dynamics of ‘deceptive’ movement signals (upper trunk yaw and out-foot placement) (p<.001). These findings were further corroborated in a second experiment where players were able to move as if to intercept or ‘tackle’ the virtual attacker. An analysis of action responses showed that experts waited significantly longer before initiating movement (p<.001). By waiting longer and picking up more information that would inform about future running direction these experts made significantly fewer errors (p<.05). In this paper we not only present a mathematical model that describes how deception in body-based movement is detected, but we also show how perceptual expertise is manifested in action expertise. We conclude that being able to tune into the ‘honest’ information specifying true running action intention gives a strong competitive advantage

That spatial shit: Exploring the space between actor training and training to play rugby union

It is sometimes argued, albeit anecdotally, that performing artists and sports practitioners have certain basic things in common when it comes to the goals and methods of training for their respective professions: discipline, focus, care of the body. However, in the case of actor training and training to play rugby union football—the two practices with which this thesis is concerned—it is also clear that arts and sports training take place within vastly different cultural contexts. Each of these fields of practice has its own set of expectations about the performative outcomes that training should support. Each acculturates quite specific bodily habits and values. On the one hand, actors are encouraged to explore a subtle form of embodiment, one that ‘awakens all the senses’ (Bogart 2005: 20) creating an openness to a variety of psychophysical demands. In contrast, a key concern of rugby union players is to be fitter, faster, stronger, and thus, techniques of the body (Mauss 1973) are shaped to reflect the requirements of the sport. Yet, although rugby union is a physically tough collision sport, there are chaotic elements of the game that require players to exploit a more intuitive set of bodily dispositions; ones that are not developed within regular rugby union training regimes. Hence the question arises, what if anything, might a rugby union player learn from being exposed to forms of actor training? And on what terms could an interaction between these different training regimes occur? In exploring the space between actor training and training to play rugby union, this thesis raises larger questions about the possibilities of crossover training between many other disciplines

That spatial shit: Exploring the space between actor training and training to play rugby union

It is sometimes argued, albeit anecdotally, that performing artists and sports practitioners have certain basic things in common when it comes to the goals and methods of training for their respective professions: discipline, focus, care of the body. However, in the case of actor training and training to play rugby union football—the two practices with which this thesis is concerned—it is also clear that arts and sports training take place within vastly different cultural contexts. Each of these fields of practice has its own set of expectations about the performative outcomes that training should support. Each acculturates quite specific bodily habits and values. On the one hand, actors are encouraged to explore a subtle form of embodiment, one that ‘awakens all the senses’ (Bogart 2005: 20) creating an openness to a variety of psychophysical demands. In contrast, a key concern of rugby union players is to be fitter, faster, stronger, and thus, techniques of the body (Mauss 1973) are shaped to reflect the requirements of the sport. Yet, although rugby union is a physically tough collision sport, there are chaotic elements of the game that require players to exploit a more intuitive set of bodily dispositions; ones that are not developed within regular rugby union training regimes. Hence the question arises, what if anything, might a rugby union player learn from being exposed to forms of actor training? And on what terms could an interaction between these different training regimes occur? In exploring the space between actor training and training to play rugby union, this thesis raises larger questions about the possibilities of crossover training between many other disciplines

An Information-Theoretic Approach to the Cost-benefit Analysis of Visualization in Virtual Environments

© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Visualization and virtual environments (VEs) have been two interconnected parallel strands in visual computing for decades. Some VEs have been purposely developed for visualization applications, while many visualization applications are exemplary showcases in general-purpose VEs. Because of the development and operation costs of VEs, the majority of visualization applications in practice have yet to benefit from the capacity of VEs. In this paper, we examine this status quo from an information-theoretic perspective. Our objectives are to conduct cost-benefit analysis on typical VE systems (including augmented and mixed reality, theatre-based systems, and large powerwalls), to explain why some visualization applications benefit more from VEs than others, and to sketch out pathways for the future development of visualization applications in VEs. We support our theoretical propositions and analysis using theories and discoveries in the literature of cognitive sciences and the practical evidence reported in the literatures of visualization and VEs

Elite rugby union coaches' interpretation and use of Game Sense in Australia and New Zealand : an examination of coaches' habitus, learning and development

Contains fulltext : 139520.pdf (publisher's version ) (Open Access)Radboud Universiteit Nijmegen, 29 april 2015Promotores : Lagro-Janssen, A.L.M., Hutton, E.K. Co-promotor : Jonge, A. d