Objectives To investigate if the 11+ injury prevention programme decreases the risk of hamstring injury and improves recovery time and determine whether compliance with the 11+ affects hamstring injury risk. Methods This study is a secondary analysis from a prospective cluster randomised controlled trial that included 65 National Collegiate Athletic Association (NCAA) division I and II men’s soccer teams over the fall 2012 season. Thirty-one teams were randomised to the intervention group that were using the 11+ as their warm-up and 35 teams to the control group that continued to use their traditional warm-up. Each certified athletic trainer (ATC) collected data on demographics, hamstring injury (HSI), mechanism of injury, position, playing surface, time lost due to injury and compliance to the 11+ programme. Results The 11+ decreased the risk of HSI by 63% compared with the control group (RR=0.37, 95% CI 0.21 to 0.63). Difference in return to play after HSI between the control (9.4±11.2 days) and intervention groups (10.2±11.3 days) was not significant (p=0.8). High compliance (>2 or more doses on average per week) reduced the risk of HSI by 78% (RR=0.22, 95% CI 0.06 to 0.87) compared with low compliance (<1 dose on average per week), and moderate compliance (1 to <2 doses on average per week) decreased the risk of HSI by 67% (RR=0.33, 95% CI 0.11 to 0.97) compared with low compliance. There was no significant difference between high and moderate compliance. Conclusion The 11+ decreased the risk of HSI by 63% but did not improve recovery time. High to moderate compliance is essential and makes the programme more effective at reducing HSI. Data are available upon reasonable request.

中文翻译：

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11+ 伤害预防计划降低了男子大学足球运动员腿筋拉伤的发生率


目的 调查 11+ 损伤预防计划是否可以降低腿筋损伤的风险并缩短恢复时间，并确定遵守 11+ 是否会影响腿筋损伤的风险。方法 本研究是一项前瞻性整群随机对照试验的二次分析，该试验包括 2012 年秋季赛季的 65 支美国大学体育协会 (NCAA) I 级和 II 级男子足球队。 31 支队伍被随机分配到使用 11+ 作为热身的干预组，35 支队伍被随机分配到继续使用传统热身的对照组。每位经过认证的运动教练 (ATC) 都会收集有关人口统计、腿筋损伤 (HSI)、损伤机制、位置、比赛场地、因损伤而损失的时间以及对 11+ 计划的遵守情况的数据。结果 与对照组相比，11 岁以上儿童的 HSI 风险降低了 63%（RR=0.37，95% CI 0.21 至 0.63）。 HSI 后，对照组（9.4±11.2 天）和干预组（10.2±11.3 天）恢复比赛的差异不显着（p=0.8）。与低依从性（平均每周 <1 剂量）和中等依从性相比，高依从性（平均每周 >2 或更多剂量）可将 HSI 风险降低 78%（RR=0.22，95% CI 0.06 至 0.87）与低依从性相比，（平均每周 1 至 <2 剂量）可将 HSI 风险降低 67%（RR=0.33，95% CI 0.11 至 0.97）。高依从性和中等依从性之间没有显着差异。结论 11+ 将 HSI 风险降低了 63%，但没有缩短恢复时间。高度到中等的合规性至关重要，这使得该计划能够更有效地降低 HSI。数据可根据合理要求提供。