School of Exercise Science, Australian Catholic University, Brisbane, Queensland, Australia.
J Sci Med Sport. 2012 Nov;15(6):496-504. doi: 10.1016/j.jsams.2012.03.017. Epub 2012 Jun 27.
Well-developed physical qualities may protect against contact injuries. However, the potential contribution of physical qualities as risk or protective factors to contact injury risk is yet to be determined for rugby league. This study applied a frailty survival model that accounts for recurrent injury to identify risk factors for all physiotherapist-reported contact injury in professional rugby league players.
Prospective cohort study.
Sixty-six professional rugby league players participated in this three successive year prospective study. At the start of each season, all players underwent measurements of standard anthropometry (height, body mass, and sum of seven skinfolds), speed (10 m and 40 m sprint), muscular strength (1 repetition maximum [RM] bench press, 1RM squat, 1RM weighted chin-ups), power (vertical jump, bench throw, 1RM power clean, jump squat), and endurance (maximum repetition bench press with 60 kg resistance), repeated-sprint ability (12 × 20 m sprints performed on a 20s cycle), prolonged high-intensity intermittent running ability (8 × 12 s maximal effort shuttles performed on a 48 s cycle), and maximal aerobic power (multi-stage fitness test). Data was used to demonstrate the application of the frailty model extension of the Cox proportional regression model for recurrent events to identify factors associated with a high hazard ratio (HR) of injury.
Heavier (body mass, HR=2.6, 95% CI=1.2-5.7), and faster (40 m sprint, HR=2.1, 95% CI=1.0-4.2) players, and those with poorly developed prolonged high-intensity intermittent running ability (HR=2.9, 95% CI=1.7-5.0) and upper-body strength (chin-up, HR=2.2, 95% CI=1.3-3.7) had a higher incidence of contact injuries.
This study demonstrates application of a novel statistical approach for the analysis of injury data that is recurrent in nature. This approach identified that the greater impact forces generated from heavier players with faster speed may result in an increase in recurrent contact injury rates. However, the development of prolonged high-intensity intermittent running ability and upper-body strength and power may assist to reduce the risk of contact injury in professional rugby league players.
良好的身体素质可能有助于预防接触性损伤。然而，身体素质作为接触性损伤风险或保护因素的潜在贡献，对于橄榄球联盟来说，其风险尚未确定。本研究应用衰弱生存模型来考虑反复受伤，以确定职业橄榄球联盟运动员所有理疗师报告的接触性损伤的危险因素。
前瞻性队列研究。
66 名职业橄榄球联盟运动员参加了这项连续三年的前瞻性研究。在每个赛季开始时，所有运动员都接受了标准人体测量（身高、体重和七个皮褶厚度总和）、速度（10 米和 40 米冲刺）、肌肉力量（1 次重复最大[RM]卧推、1RM 深蹲、1RM 负重引体向上）、功率（垂直跳跃、卧推投掷、1RM 力量清洁、跳跃深蹲）和耐力（60 公斤阻力下的最大重复卧推）、重复冲刺能力（20 秒周期内进行 12×20 米冲刺）、长时间高强度间歇跑能力（48 秒周期内进行 8×12 秒最大努力穿梭跑）和最大有氧能力（多阶段健身测试）的测量。数据用于展示衰弱模型扩展的 Cox 比例风险回归模型在反复发生事件中的应用，以确定与高伤害风险比（HR）相关的因素。
体重较重（体重，HR=2.6，95%CI=1.2-5.7）和速度较快（40 米冲刺，HR=2.1，95%CI=1.0-4.2）的运动员，以及那些长时间高强度间歇跑能力较差（HR=2.9，95%CI=1.7-5.0）和上半身力量（引体向上，HR=2.2，95%CI=1.3-3.7）的运动员，接触性损伤发生率更高。
本研究展示了一种新的统计方法在分析本质上是反复发生的伤害数据中的应用。该方法表明，较重的运动员速度较快，可能会产生更大的冲击力，从而导致反复接触性损伤率的增加。然而，发展长时间高强度间歇跑能力以及上半身力量和功率可能有助于降低职业橄榄球联盟运动员接触性损伤的风险。
