Onset Timing of Electromyographic Activity in the Vastus Medialis Oblique and Vastus Lateralis Muscles in Subjects With and Without Patellofemoral Pain Syndrome

Abstract

These findings contradict a previous report of differences in reflex timing related to PFPS. Differences in the relative timing of onset of EMG activity of the VMO and VL during voluntary knee extension were not significant between SYMP and ASYMP groups, and were not related to the relative timing differences observed during reflex testing.