1UHZ Sports Medicine Institute, Doctors Hospital, Baptist Health South Florida, Coral Gables, Florida; 2Sports Medicine and Performance, Tampa, Florida; 3Rehabilitation, Tampa Bay Buccaneers, Tampa, Florida; and 4Orthopaedic Surgery, Johns Hopkins Hospital School of Medicine, Medstar Good Samaritan Hospital, Baltimore, Maryland.
J Strength Cond Res. 2014 Apr;28(4):875-83. doi: 10.1519/JSC.0b013e3182a20f19.
Isokinetic concentric quadriceps and hamstring strength data using a Cybex dynamometer are collected for elite collegiate American football players invited to the annual National Football League Scouting Combine. We constructed a normative (reference) database of the Cybex strength data for the purpose of allowing comparison of an individual's values to his peers. Data reduction was performed to construct frequency distributions of hamstring/quadriceps (H/Q) ratios and side-to-side strength differences. For the cohort (n = 1,252 players), a statistically significant but very small (1.9%) mean quadriceps strength preference existed for dominant side vs. nondominant side. Peak torque (Newton meters, best repetition) for quadriceps and hamstrings was significantly correlated to player body mass (weight) (the same relationship was found for other variables using peak torque in the calculation). Peak torque varied by player position, being greatest for offensive linemen and lowest for kickers (p < 0.0001). Adjusting for body weight overcorrected these differences. The H/Q ratios and frequency distributions were similar across positions, with a mean of 0.6837 ± 0.137 for the cohort dominant side vs. 0.6940 ± 0.145 for the nondominant side (p = 0.021, n = 1,252). Considerable variation was seen for dominant-to-nondominant side difference for peak torque. For quadriceps, 47.2% of players had differences between -10% and +10%, 21.0% had a peak torque dominant-side deficit of 10% or greater compared to nondominant side, and for 31.8% of players, dominant-side peak torque was greater than 10% compared to nondominant side. For hamstrings, 57.0% of players had differences between -10% and +10%, 19.6% had a peak torque dominant-side deficit of 10% or greater compared to nondominant side, and 23.4% of players, dominant-side peak torque was greater than 10% compared to nondominant side. We observed that isokinetic absolute strength variables are dependent on body weight and vary across player position. The H/Q ratios vary only within a relatively narrow range. Side-to-side differences in strength variables >10% are common, not the exception.
对参加美国国家橄榄球联盟选秀联合收割机的精英大学生美式足球运动员进行了等速向心股四头肌和腘绳肌力量的 Cybex 测力计数据收集。我们构建了 Cybex 力量数据的规范（参考）数据库，以便将个体的值与同龄人进行比较。进行了数据简化，以构建腘绳肌/股四头肌（H/Q）比值和侧间力量差异的频率分布。对于队列（n=1252 名运动员），优势侧与非优势侧之间存在统计学上显著但非常小（1.9%）的股四头肌力量偏好。股四头肌和腘绳肌的峰值扭矩（牛顿米，最佳重复）与运动员体重（重量）显著相关（在计算中使用峰值扭矩时，发现了其他变量的相同关系）。球员位置的峰值扭矩差异很大，进攻线球员最大，踢球手最低（p<0.0001）。根据体重进行调整纠正了这些差异。H/Q 比值和频率分布在各个位置相似，队列优势侧的平均值为 0.6837±0.137，非优势侧的平均值为 0.6940±0.145（p=0.021，n=1252）。在优势侧与非优势侧之间的峰值扭矩差异方面，观察到相当大的变化。对于股四头肌，47.2%的运动员的差异在-10%和+10%之间，21.0%的运动员的峰值扭矩优势侧比非优势侧低 10%或更多，31.8%的运动员的优势侧峰值扭矩比非优势侧高 10%或更多。对于腘绳肌，57.0%的运动员的差异在-10%和+10%之间，19.6%的运动员的峰值扭矩优势侧比非优势侧低 10%或更多，23.4%的运动员的优势侧峰值扭矩比非优势侧高 10%或更多。我们观察到，等速绝对强度变量取决于体重，并且在球员位置之间有所不同。H/Q 比值仅在相对较窄的范围内变化。强度变量的侧间差异>10%很常见，而不是例外。
