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POSTER ABSTRACTS - THURSDAY, 21 MAY 2015strengthening of adductors and triceps-surae) in October and April. In March, we will also add afourth 20-minute injury-prevention session and reduce training by substituting a weekly recoverysession instead of a training session.P07.02Very-high chronic workload is not related to injury in elite rugby league playersBilly Hulin(1,2), T Gabbett(3,4), P Caputi(1), D Lawson(2), J Sampson(1)(1) University of Wollongong, Wollongong, Australia(2) St George Illawarra Dragons Rugby League Club, Wollongong, Australia(3) Australian Catholic University, Brisbane, Australia(4) University of Queensland, Brisbane, AustraliaObjective: To investigate the relationship between global positioning system (GPS) derived acuteand chronic workloads and injury risk in elite rugby league players.Methods: GPS data were collected from 53 elite players over two Australian National RugbyLeague seasons. Acute (1-week total distance), and chronic (4-week rolling average total distance)workloads were classified as ‘very-low’ through ‘very-high’ based on z-scores. The relativedifference between acute and chronic workloads provided a training-stress balance.Results: Very-large effect size (ES) differences (ES = 3.03 ± 0.51 – 6.08 ± 0.40) in total distancewere observed between very-high chronic workloads and all other chronic workload categories; yetno significant differences (p = 0.999) in the likelihood of injury were found. There was nodifference (p = 0.314) between the proportion of injuries observed at low and high acuteworkloads. However, when players had a high chronic workload, a very-high training-stressbalance increased the risk of injury compared with a moderate training-stress balance (p = 0.038,relative risk = 4.61 ×/÷ 1.8). Furthermore, when players had a moderate training-stress balance,there was no difference (p = 0.140) in injury likelihoods between high and low chronic workloads.Conclusion: Independently, neither ‘high’ acute nor ‘very-high’ chronic workloads influence injuryrisk in elite rugby league players. However, very-high increases in acute workload, relative to highchronic workload increases injury likelihoods 4-fold. Practitioners should note that high chronicworkloads can be achieved without increasing the likelihood of injury, provided that acute workloadis systematically increased relative to chronic workload.P07.03Mechanism of anterior xruciate ligament injuries in female soccer playersSatoshi Kaneko(1), S Sasaki(2), Y Nagano(3), N Hirose(1), T Fukubayashi(1)(1) Waseda University, Graduated School of Sport Sciences, Saitama, Japan(2) Tokyo Ariake University of Medical and Health Sciences, Tokyo, Japan(3) Niigata University of Health and Welfare, Niigata, JapanFemale soccer players have a higher risk of the non-contact anterior cruciate ligament (ACL) injurycompared with other athletes. A previous study has reported that the ACL injury often occurs due tocontact with a ball and not with other players. However, it has not been clarified which kind ofmanoeuvre cause the ACL injury. To clarify the above issue, we undertook a questionnaire survey222