Biomechanics of aggressive inline skating: landing and balancing on a grind rail

Currently, only epidemiological injury data have been reported for the new extreme sport of aggressive inline skating, or trick skating. No studies have examined the biomechanics of this sport, which involves repetitive jumping and landing from railings, ramps, and ledges, often over 1 m in height. We present results of a pilot study that examined the effect of skater experience and lower extremity biomechanics on energy absorption ability, and observed balance strategies used during two basic tricks. In these tricks, the skater jumps onto an elevated rail and maintains balance while standing in a single position (stall) or sliding along the rail (grind). Lower extremity joint kinematics, impact force characteristics, and general movement behaviours were examined during landing and balance phases. Ten male skaters performed ten stalls and ten frontside grinds on an instrumented grind rail, capable of measuring vertical force. Vertical impact force was found to decrease with increasing skater experience in stalls (r = -0.84, P = 0.002) and grinds (r = -0.84, P = 0.009). This might imply that less-experienced skaters are (subconsciously) more concerned about maintaining balance than refining technique to minimize impact force. Similar to drop landing experiments, peak impact force decreased with increasing knee flexion during stalls (r = -0.65, P = 0.04). During stalls, skaters demonstrated classic balance maintenance strategies (ankle, hip, or multi-joint) depending on trick length. During grinds, skater centre of mass never passed over the rail base of support, suggesting the use of momentum produced from obliquely approaching the rail.     

Specters in the Archive: Faculty Digital Image Collections and the Problems of Invisibility

This paper presents the findings of a research study which investigated the digital preservation practices among two faculty user groups, archeologists and art historians. This faculty's knowledge of digital preservation practices and their perceptions and emotions concerning the digital images they had created and, or collected to support their professional activities were examined. What was discovered is a worrisome situation where an important part of our cultural record is at serious risk of being lost.     

THE THEOLOGICAL ANTHROPOLOGY OF THOMAS GROOME

Theological anthropology in the work of Thomas Groome can be understood by exploring the relationship between subjectivity and knowledge in his major works. This relationship is constituted by five fundamental elements: the knowing subject in religious education as existential, liberational, pedagogical, theological, and critical. A comprehension of this constitutive core of his theological anthropology affords a map for understanding the logic of his contribution to religious education.     

British running performances in the eighteenth century

Our aims were to improve our understanding of human performance before 1850 and to put nineteenth- and twentieth-century performances into a broader historical context. Consequently, 536 foot-races performed in Britain in the 'long' eighteenth century were identified, 53 of which were analysed in detail. The best performances at the end of the eighteenth century were compared with those at the end of the nineteenth and twentieth centuries. The data for the nineteenth century were marginally better than those for the eighteenth century up to 20 km, but beyond that Thomas Carlisle's time, set in about 1740, of 2 hours for 21 miles was outstanding. Current records are shown to be better than earlier records at all distances from 5 km up to the marathon, the superiority being most pronounced from 15 km upwards.     

The baton exchange during the 4×100 m relay: a mathematical analysis

Using mathematical analysis, we examined the three baton exchanges that occur during a 4×100 m relay. Identical representative 100 m running performances were assumed for each of four elite male athletes, and the calculations were made for optimal or near-optimal positions of the baton exchanges and starting positions of the athletes running the second, third and fourth legs as determined by Ward-Smith and Radford (2002). In this paper, we focus on the calculation of the checkmark position and demonstrate the complexity of the baton exchange process. The results of the mathematical analysis show that, for optimal performance, the checkmark should be located differently for each of the three exchanges in a single race, and is further affected by lane draw and free distance (the distance between the runners at the baton exchange). For a representative free distance of 1 m at each exchange, the checkmark distance ranges from a minimum of 11.04 m at the third exchange in Lane 1 to 12.20 m for the first exchange in Lane 8. Failure by teams and their coaches to consider adequately the complexities of the baton exchanges may help explain why 25.5% of teams in recent World Championships were disqualified or did not finish.     

Health education assessment practices used by physical education and health teachers in a collaborative action research

ABSTRACT

Background: The school setting is the ideal environment for encouraging students to adopt health-promoting behaviours (Chong, McCuaig and Rossi, 2018, “Primary Physical Education Specialists and their Perceived Role in the Explicit/Implicit Delivery of Health Education.” Curriculum Studies in Health and Physical Education 9 (2): 189–204. doi: 10.1080/25742981.2018.1452163). Schools are actively supporting the implementation of health education (HE) initiatives, and the potential contribution of physical education (PE) to these initiatives is recognised in a number of countries (Gray, MacIsaac and Jess, 2015, “Teaching ‘Health’ in Physical Education in a ‘Healthy’ Way.” Retos 28 (1): 165–172; Haerens, Kirk, Cardon and De Bourdeaudhuij, 2011, “Toward the Development of a Pedagogical Model for Health-Based Physical Education.” Quest 63 (3): 321–338. doi: 10.1080/00336297.2011.10483684). One of the biggest challenges faced by PE teachers is the assessment of student learning in the area of health (Bezeau, 2019, “L’accompagnement d’enseignantes en éducation physique et à la santé visant l’optimisation de leurs pratiques évaluatives en éducation à la santé.” PhD diss., Université de Sherbrooke; Turcotte, Gaudreau, Otis and Desbiens, 2010, “Les pratiques pédagogiques d’éducateurs physiques du primaire en éducation à la santé.” In Éducation à la santé, edited by Claire Isabelle, Louise Sauvé, and Monique Noël-Gaudreault, 717–738. Montréal: Revue des sciences de l’éducation). These challenges highlight the need for professional development that meets the needs of PE teachers in regard to the health component, in particular in terms of assessment practices (Turcotte, 2010, “Problématisation: l’éducation à la santé et l’éducation physique.” In Faire équipe pour une éducation à la santé en milieu scolaire, edited by Johanne Grenier, Joanne Otis, and Gilles Harvey, 25–48. Québec: Presses de l’Université du Québec). However, teachers report that the professional development provided to better integrate health into PE is ineffective (Alfrey, Cale and Webb, 2012, “Physical Education Teachers’ Continuing Professional Development in Health-Related Exercise: A Figurational Analysis.” European Physical Education Review 18 (3): 361–379. doi: 10.1177/1356336X12450797; Makopoulou and Armour, 2011, “Teachers’ Professional Learning in a European Learning Society: the Case of Physical Education.” Physical Education and Sport Pedagogy 16 (4): 417–433. doi: 10.1080/17408989.2010.548060). In order to optimise assessment practices in HE, the development of training methods that answer the real needs of PE teachers constitutes a potential solution to this problem. In this study, two PE teachers were supported in the operationalisation and appropriation of an innovative problem-solving process aimed at optimising their assessment practices in HE.

Objectives: The objectives of this article are to describe: 1) the operationalisation of strategies established by the participants targeting their assessment practices in HE, and 2) the evolution of these practices.

Method: A collaborative action research (CAR) approach was taken, and four methods of data collection were used: 1) individual interviews; 2) group interviews; 3) participant observation, and 4) logbooks. The data was collected over a 12-month period, overlapping two school years, and then analyzed through content analysis.

Findings: Results suggest that, despite the planning and implementation of strategies considered effective by the participants, their assessment practices in the gymnasium progressed very little, while their practices outside the gymnasium evolved considerably.

Conclusion: If we want to optimise assessment practices in HE, or teaching practices in general, we must put aside the question ‘why,’ and focus on ‘how’ to meet the challenges related to the implementation of this type of professional development. Bringing real change to teaching practices is a long process that requires an investment of time and effort from teachers, and starts with the optimisation of practices outside the learning environment.