Assessing rugby place kick performance from initial ball flight kinematics: development,validation and application of a new measure

The appropriate determination of performance outcome is critical when appraising a performer’s technique. Previous studies of rugby place kicking technique have typically assessed performance based on ball velocity, but this is not the sole requirement. Therefore, a mathematical model of rugby place kick ball flight was developed to yield a single measure more representative of true performance. The model, which requires only initial ball flight kinematics, was calibrated and validated using empirical place kick data, and found to predict ball position with a mean error of 4.0% after 22 m of ball flight. The model was then applied to the performances of 33 place kickers. The predicted maximum distance, a single performance measure which accounted for initial ball velocity magnitude and direction, and spin, was determined using the model and was compared against ball velocity magnitude. A moderate association in the rank-order of the kicks between these two measures (ρ = 0.52) revealed that the relative success of the kicks would be assessed differently with each measure. The developed model provides a representative measure of place kick performance that is understandable for coaches, and can be used to predict changes in performance outcome under different ball launch or environmental conditions.     

Choice of sprint start performance measure affects the performance-based ranking within a group of sprinters: which is the most appropriate measure?

Sprint start performance has previously been quantified using several different measures. This study aimed to identify whether different measures could influence the performance-based ranking within a group of 12 sprinters, and if so, to identify the most appropriate measure. None of the 10 performance measures ranked all sprinters in the same order; Spearman's rho correlations between different block phase measures ranged from 0.50 to 0.94, and between block phase measures and those obtained beyond block exit from 0.66 to 0.85. Based on the consideration of what each measure quantifies, normalised average horizontal external power was identified as the most appropriate, incorporating both block velocity and the time spent producing this velocity. The accuracy with which these data could be obtained in an externally valid field setting was assessed against force platform criterion data. For an athlete producing 678 +/- 40 W of block power, a carefully set-up manual high-speed video analysis protocol produced systematic and random errors of +5 Wand +/- 24 W, respectively. Since the choice of performance measure could affect the conclusions drawn from a technique analysis, for example the success of an intervention, it is proposed that external power is used to quantify start performance.     

Teachers as Leaders: A critical agenda for the new millennium

Education systems around the world are implementing school-based management organisational reforms resulting in new and enhanced roles for teachers. As a result, traditional notions of what skills, knowledge, competencies and attitudes teachers need to carry out their roles and responsibilities are changing. Fundamental to the necessary changes for teachers is promotion of a 'teachers-as-leaders' agenda, one which is conceptualised around a leadership framework that facilitates a rethinking of teachers' work and that has similarities with that usually associated with school administrators. This paper uses current developments in Queensland government schools to illustrate this changing world for teachers.     

Motivation to Learn: The pedagogical nexus in the Russian school: Some implications for transnational research and policy borrowing

Earlier research had shown that in some Russian schools, pupils were significantly more highly motivated to learn in school than in some American and English schools. Further inquiry was conducted to ascertain to what extent such high motivation might be attributed to schooling-related factors. It is suggested that Russian schools exhibit a 'pedagogical nexus' - a set of linked, interactive and mutually reinforcing influences on pupils' motivation to learn within and because of the schooling process- in which continuity of school, class and teacher - inter-generational continuity; closeness of home-school relations; readiness and preparation for schooling; the articulation of a national curriculum in school texts and in a critical pedagogics; the extent and character of inter-relation between lesson, textbook, homework and assessment; and the role of memorisation in learning - play highly inter-related and mutually attuned roles. It is argued that the terms of explanation of an unfamiliar education system cannot be reliably used for the identification of isolable practices for transnational export to other systems. Explanations of unfamiliar systems can, however, raise powerful and pointed evaluative questions of general interest.