TY  - BOOK
AU  - Papp, Derek F
TI  - Isokinetic concentric quadriceps and hamstring normative data for elite collegiate American football players participating in the NFL Scouting Combine
SN  - 1064-8011
PY  - 2014///
KW  - *Athletic Performance/ph [Physiology]
KW  - *Body Weight
KW  - *Football/ph [Physiology]
KW  - *Muscle Strength/ph [Physiology]
KW  - *Quadriceps Muscle/ph [Physiology]
KW  - Adult
KW  - Anthropometry
KW  - Athletes/sn [Statistics & Numerical Data]
KW  - Athletic Injuries/pc [Prevention & Control]
KW  - Biomechanical Phenomena
KW  - Cohort Studies
KW  - Confidence Intervals
KW  - Databases, Factual
KW  - Humans
KW  - Kinetics
KW  - Male
KW  - Muscle Contraction/ph [Physiology]
KW  - Muscle Strength Dynamometer
KW  - Reference Values
KW  - United States
KW  - Young Adult
KW  - MedStar Good Saaritan Hospital
KW  - Orthopaedic Surgery
KW  - Comparative Study
KW  - Journal Article
N1  - Available online through MWHC library: 1987 - present
N2  - 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
UR  - http://dx.doi.org/10.1519/JSC.0b013e3182a20f19
ER  -