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I am currently working on my thesis, which is an examination of the amount of electrical activity that occurs in the vastus medialis and rectus femoris during three different knee extension patterns. I am using the Biopac 100 System for Macintosh for the EMG analysis. I have integrated the signals that I have obtained. At this point, I am not sure which of the available measures would best represent the amount of muscle activity that occurred between selected time points. I have narrowed my choices down to mean, integral, and area under the curve. I would be very grateful if anyone could give input as to which measurement would be the best along with the rationale as to why. Thank you for your time and assistance. Tina L. Franchitto, ATC E-mail: [log in to unmask] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%