UHZ Sports Medicine Institute, Doctors Hospital, Baptist Health South Florida, 1150 Campo Sano Ave, Suite 200, Coral Gables, FL 33146, USA.
Am J Sports Med. 2013 Jul;41(7):1511-8. doi: 10.1177/0363546513487983. Epub 2013 May 28.
There are conflicting reports regarding the association between isokinetic concentric quadriceps and hamstring strength deficits and ratios and risk for hamstring injuries in athletes.
To determine if isokinetic concentric Cybex data collected during the annual National Football League (NFL) Scouting Combine are predictive of hamstring injury in professional American football players during their first season.
Case-control study; Level of evidence, 3.
All 32 NFL teams identified players selected during the first 5 rounds of the NFL annual draft who had hamstring injuries during their first professional season. Of these, 164 players with 172 injuries also had Cybex data from the previous year's Combine. Analyses compared injured legs with contralateral uninjured legs and also injured players with uninjured controls using a database of Cybex data from all players who participated in the NFL Scouting Combine from 2006 to 2011.
No Cybex strength variable differentiated the injured legs from the contralateral uninjured legs or injured players from uninjured controls, even after taking into account days lost from activity. Mean ± SD peak torque for the injured and contralateral uninjured sides was as follows: 315.7 ± 70.0 and 313.5 ± 68.3 N · m, respectively (P = .773, paired t test), for quadriceps and 203.0 ± 42.4 and 205.3 ± 42.5 N · m, respectively (P = .608, paired t test), for hamstrings. The sensitivity and specificity for the hamstrings-to-quadriceps ratio predicting hamstring injury were 0.513 (95% confidence interval, 0.419-0.607) and 0.524 (0.495-0.554), indicating that the hamstrings-to-quadriceps ratio was not a useful predictor of injury (calculation used the mean ± SD ratio for injured legs, 0.656 ± 0.133). Side-to-side peak torque differences were also not predictive of injury, with more than a 10% difference (plus or minus) occurring commonly in both injured and uninjured players for quadriceps (53% prevalence for both injured and uninjured) and hamstrings (injured, 41% prevalence; uninjured, 43% prevalence).
Isokinetic strength data collected from collegiate players at the NFL Scouting Combine were not useful for predicting risk of hamstring injury in subsequent professional NFL competition. These data call into question commonly accepted assumptions about risk factors for hamstring injury, at least for elite collegiate American football players, when the temporal relationship between Cybex testing and actual injury is several months.
在运动员的股四头肌和腘绳肌等速向心力量不足和比值与腘绳肌损伤风险之间的关系方面，存在相互矛盾的报告。
确定在职业美式足球运动员的首个赛季中，国家橄榄球联盟（NFL）选秀联合体能测试中收集的等速向心 Cybex 数据是否可预测腘绳肌损伤。
病例对照研究；证据水平，3 级。
所有 32 支 NFL 球队均确定了在 NFL 年度选秀的前 5 轮中被选中、在首个职业赛季中发生腘绳肌损伤的球员。其中，164 名球员的 172 处损伤也具有前一年选秀联合体能测试的 Cybex 数据。分析通过使用 2006 年至 2011 年参加 NFL 选秀联合体能测试的所有球员的 Cybex 数据库，比较受伤腿与对侧未受伤腿以及受伤球员与未受伤对照的差异。
即使考虑到活动损失的天数，也没有 Cybex 力量变量可区分受伤腿与对侧未受伤腿，或受伤球员与未受伤对照。受伤和对侧未受伤侧的峰值扭矩均值±SD 分别为：315.7±70.0 和 313.5±68.3 N·m（P=.773，配对 t 检验），用于股四头肌和 203.0±42.4 和 205.3±42.5 N·m（P=.608，配对 t 检验），用于腘绳肌。预测腘绳肌损伤的腘绳肌/股四头肌比值的敏感性和特异性分别为 0.513（95%置信区间，0.419-0.607）和 0.524（0.495-0.554），表明腘绳肌/股四头肌比值不是损伤的有用预测指标（计算使用受伤腿的均值±SD 比值，0.656±0.133）。腿间峰值扭矩差异也不能预测损伤，在受伤和未受伤的运动员中，股四头肌（受伤者，53%的患病率；未受伤者，53%的患病率）和腘绳肌（受伤者，41%的患病率；未受伤者，43%的患病率）通常都有超过 10%的差异（加减）。
在 NFL 选秀联合体能测试中从大学生运动员那里收集的等速力量数据对于预测随后的职业 NFL 比赛中腘绳肌损伤的风险并不有用。这些数据至少对精英大学生美式足球运动员提出了对腘绳肌损伤风险因素的普遍接受的假设的质疑，因为 Cybex 测试与实际损伤之间的时间关系是几个月。
