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recording the incidence of important musculoskeletal injuries. Themajor strength of the injury definition is excellent reliability.

http://dx.doi.org/10.1016/j.jsams.2012.11.250

Thursday 1 November Papers / Journal of Sc

ith high SES. However little is known about objectively mea-ured MVPA among ethnic minority groups in Denmark. Basedn baseline data from the When Cities Move Children study,his study investigates the association of the built environment,ocio-demographic and social support variables on children’s dailyhysical activity.

Methods: Participants were 291 children from four schools indiverse ethnic minority community in Copenhagen, Denmark

10–16yrs). Physical activity data were obtained using accelerome-ers (Actigraph GT3X, 30 sec epoch) and Evenson cutpoints weresed to determine mean daily time in MVPA. Exposure variablesere based on questionnaire data, registry data, GPS/GIS derived

ariables and accelerometer data. Data were analyzed in STATAmp2 using a 3-level mixed multilevel model to examine both unad-

usted and adjusted models.Results: Among the participants 45% were boys, 42.5% had at

east one parent who did not work and 64.3% had at least one parentith an ethnic minority background. The adjusted analyses showed

hat boys engage in significantly more minutes of daily MVPA thanirls (boys: 57.8, girls: 36.9, p < 0.001) and that boys from a Dan-sh ethnic family accumulated significantly less minutes of daily

VPA compared to boys from an ethnic minority family (p < 0.001).irls in grade 7 (13–14yrs) accumulated the least minutes of MVPA

p < 0.05). Being in a class with a high average mean MVPA wasignificantly associated with higher individual MVPA among bothoys (p < 0.001) and girls (p < 0.05). None of the included built envi-onment variables were significantly associated with MVPA in thedjusted model.

Discussion: This study contradicts the notion that ethnic minor-ty boys are less physically active than Danish boys. Anecdotal worko far confirms the hypothesis that these boys are bound to spendhe majority of their leisure time outdoors in their local commu-ity due to crowding in their home while girls are confined to theome to stay out of trouble and help in the home. Further analysesased on available GPS data on these participants will provide more

nsight, leading to new documentation on the association on out-oor time and physical activity level as well as new knowledge onhich built environment variables may be relevant for this group

f children.

ttp://dx.doi.org/10.1016/j.jsams.2012.11.248

vidence informing change in Australian Football

46

ymposium

Australian Football LeagueAustralian Football is a game enjoyed by people all over the

orld, with average AFL attendance of 34,893, 650,373 AFL clubembers, 790,905 participants at community level and 2537

ommunity clubs. Total player payments at AFL level total $159illion, and the AFL Grand Final is consistently the most watched

nnual sporting event in Australia, with 3.5 million viewers in011. Accompanying the growth of the game has been a signif-

cant growth in AFL club football departments in the coaching,dministration, player welfare, sport medicine and sport scienceisciplines. In each of these areas, there are numerous exampleshere evidence is used to inform decision making and change. Theresentations delivered as part of this session aim to illustrate how

vidence is used across different parts of the industry, includingnjury prevention, treatment and rehabilitation, physical prepa-ation and recovery, monitoring of game trends and law making.erspectives covered will include those of the administrator, sports

and Medicine in Sport 15 (2013) S34–S126 S103

physician, physiotherapist, former player and laws of the gamecommittee member.

Paper 1: Twenty years of injury surveillance in the Australian Foot-ball League: Implications and evidence for change

Paper 2: Evidence upon which injury prevention and rehabilitationstrategies have been developed

Paper 3: Evidence of game demands and strategies to prepare play-ers

Paper 4: Changes in laws and interpretations based on game infor-mation and trends

Paper 5: AFL research program strategy for 2012–16

http://dx.doi.org/10.1016/j.jsams.2012.11.249

247

Twenty years of injury surveillance in the Australian FootballLeague: Implications and evidence for change

J. Orchard 1,∗, H. Seward 2, J. Orchard 1

1 University of Sydney2 AFLMOA, Melbourne

Introduction: AFL injury surveillance has been ongoing for 20seasons, with all causes of missed games through injury in play-ers/teams accounted for over the past 15 seasons. There has beena gradual move from descriptive surveillance to more analyticalresearch.

Methods: The definition of an injury is one which resulted ina match being missed. The major units presented each season, ina public release, are injury incidence (new and recurrent injuriesper club per season) and injury prevalence (matches missed perclub per season). The twenty years of injury reports, encompassing308843 player weeks, were reviewed to summarise major trendsin the injury profile.

Results: The most prevalent and common (of the 12767 newand 1900 recurrent injuries) injury in the AFL has consistently beenthe hamstring strain in every season of the survey. On average thereare 6 hamstring injuries per club per season causing 20 weeks to bemissed. The other two injury categories most consistently in the topthree for injury prevalence are groin injuries and knee ACL injuries.The major trends and achievements of the 20-year-survey periodwere: 1) ongoing compliance of all teams and annual public release2) the centre circle rule change to reduce risk of ruck PCL injuries3) appreciation that grass/ground condition are a risk factor forACL injuries 4) long-term reduction of recurrence rates for musclestrains in particular 5) low rates of head and neck injuries in seconddecade compared to first 6) reduction of hamstring injuries in 2011after introduction of the substitute rule.

Discussion and Conclusion: The AFL injury surveillance sys-tem is one of the world’s leading systems in professional sport.Real change has been effected as a result of the survey. The injurysurvey definition is useful at monitoring trends in injuries and