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EMG Onset Timing

To the Editor:

I read the recent report by Gilleard and colleagues (January 1998) with great interest, in the hope that the study would shed more light on the issue of relative timing of vastus medialis oblique muscle (VMO) and vastus lateralis muscle (VL) electromyographic (EMG) activity during voluntary activation. I was both surprised and disappointed to find that there were no direct measures of EMG onset timing anywhere in the article. The question posed by the authors—whether patellar taping changes the relative timing of EMG onset in the VMO and VL when subjects ascend and descend stairs—is certainly worthy of investigation. But despite statements such as "changed the timing of VMO and VL activity" and "earlier activation of the VMO," the authors never actually present any timing data, choosing instead to present, analyze, and discuss data only in terms of knee angle....

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The Effect of Patellar Taping on the Onset of Vastus Medialis Obliquus and Vastus Lateralis Muscle Activity in Persons With Patellofemoral Pain

Wendy Gilleard, Jenny McConnell, and David Parsons
Physical Therapy 1998 78: 25-32. [Abstract] [PDF]

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				G. L Soderberg and L. M Knutson A Guide for Use and Interpretation of Kinesiologic Electromyographic Data Physical Therapy, May 1, 2000; 80(5): 485 - 498. [Abstract] [Full Text] [PDF]