Date of Award
Doctor of Physical Therapy (DPT)
With sports participation be it from children, teenagers, or adults; injuries will occur. In 2008-2009 an increase in high school sports participation was at an all-time high increasing to just above 7.5 million. Within this population, knee injuries ranked 3rd, with anterior cruciate ligament (ACL) injuries ranking 4th among all knee injuries. The purpose of this study was to compare muscle activation of six lower extremity muscles in five different foot positions during a single-leg squat in attempts to associate a certain foot position with an increase/decrease in muscle activation, which could then be proposed as a risk factor for ACL injury. Three male and three female subjects performed single-leg squats in neutral, and on inclines of five and ten degrees to simulate pronation and supination depending on the slant of the board. No significant differences were found in the muscle activity for any of the six muscles for a given foot position (P<.05). Further evaluation, in terms of an increased number of subjects, to be able to obtain a normal value to more appropriately interpret statistical evidence and standardizing the depth of the single-leg squat, as muscle activation changes with the depth of a squat, should be done to determine if significance does in fact exist.
Wessman, Erin L., "INFLUENCE OF FOOT POSITION ON LOWER EXTREMITY MUSCLE ACTIVATION" (2011). Physical Therapy Scholarly Projects. 620.