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Q. At what intensity should I run Active Recovery and Massage?
A. Active Recovery and Massage have benefits up to about 50 mA. Beyond this point, you are likely to cause additional muscle fatigue rather than assisting with recovery. Most individuals will not reach that high mA setting, but it is recommended that you reach intensities of at least 30 mA in order to get the benefits of the program. If sufficient intensities are not reached, your targeted muscle group will not receive a proper flush, and the program will not be as effective. Also, for the program to be most effective, the peak intensity should be reached as soon as possible.
from http://www.hammernutrition.com/downloads/Electrical-Muscle-Stimulation-EMS-FAQs.pdf