Methodology

• The Cybex test uses a peak torque (FtLbs) ratio of hamstring-to-quadriceps strength. Because the hamstrings deaccelerate the quadriceps during ambulation, the expected torque of the hamstrings must be at least 50 percent of the torque of the quadriceps. An imbalance in this ratio indicates injury.
  
  

Use

• The Cybex test might be best known for its use in draft days for the National Football League (NFL). It is also used by physical therapists, sports nutritionists and other rehabilitation professionals.
  
  

Training Use

• The Cybex test is also used in the world of athletics to measure the difference in strength between the right and left leg. This is used in coaching and drills to guide what exercises might restore equilibrium in the legs.