We recruited 58 healthy female soccer players (age from 11 to 20 years old), but we excluded those who have history of previous ACL injury or repair, previous injury that resulted in ligamentous laxity at the ankle, hip or knee, presence of any medical or neurological condition that would hurt their ability to perform a landing task.
We use an eight- camera, three dimensional motion analysis systems to collect kinematic data. Reflective markers were placed bilaterally in certain places. Electromyographic (EMG) activity of the medial ham strings, laterl hamstrings and the vastud lateralis of the dominant lower extremity were recorded. EMG data were normalized to the highest magnitude of EMG activity acquired during a maximum voluntary isometric
We use an eight- camera, three dimensional motion analysis systems to collect kinematic data. Reflective markers were placed bilaterally in certain places. Electromyographic (EMG) activity of the medial ham strings, laterl hamstrings and the vastud lateralis of the dominant lower extremity were recorded. EMG data were normalized to the highest magnitude of EMG activity acquired during a maximum voluntary isometric