Hz refers to frequency which doesn´t change no matter what it goes through. Some stray currents go outside the arteries which is probably what you were reading. .1 to .13 milliamps is the best range of current to receive from the unit. Go to the second page of http://dragonfly75.com/book/ to see my construction plans for sale. Floow the links at http://dragonfly75.com/eng/Electrifier.html for lots of good Beck device info.