Date Approved


Graduate Degree Type


Degree Name

Physical Therapy (M.S.)

Degree Program

Physical Therapy

First Advisor

Arthur Schwarcz

Second Advisor

Gordon Alderink

Third Advisor

Thomas Herzog


The purpose of this study was to determine how closed chain anterior tibial translation (ATT) affected quadriceps femoris recruitment as evidenced by electromyography.; Forty-three healthy subjects performed a unilateral squat under two conditions: anterior tibial force (ATF) and no tibial force (NTF). Two adjustable-height pulleys produced ATF by each pulling with ten percent of body weight in opposite directions on the proximal tibia and distal femur. Electromyographic (EMG) activity of the rectus femoris, vastus medialis, and vastus lateralis was monitored using surface electrodes. Percentage change in EMG area between the two squat conditions was averaged across all subjects and muscles. The squat under ATF conditions produced a significant increase in EMG activity of 14% as compared to NTF conditions (p {dollar}<{dollar}.001). Therefore, the authors concluded that ATF facilitated quadriceps femoris recruitment in a unilateral isometric squat. This facilitation technique has clinical significance in the rehabilitation of lower extremity pathologies.


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