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njlauren -> RE: Tens unit placement on females (7/3/2013 10:20:04 PM)
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quote:
ORIGINAL: epiphiny43
Tesla? You got A's in EE history? Try George W. It was in all the papers, hard to miss.
The problem with electrical play isn't skin resistance breakdown, it's the near total lack of understanding of the differential resistances of paths over and through the body. Why workers (usually) survive hand to hand (This means direct path is Across the upper chest and both diaphragm and heart nerves?) 220AC at considerable amperage and 100ma along a Pacemaker wire to the critical nerve center is sufficient to disrupts heart rhythm. Current doesn't take the Shortest path, it takes the Least Resistance path. And if skin resistance breaks down right at commercial AC Hertz, there's a WHY current travels over the surface of the body preferentially? (Lightning strikes vaporise and even take flesh to plasma, so have somewhat different behaviors.) And your micro-amps isn't what the people working with Pacemakers consider dangerous. 80-100ma has been quoted in public literature. Being a professional, I'm sure you have even better access to that? Electrical potential measured during nerve function isn't that function. It's a byproduct of the chemical messages within the nerve and at the communication pads at each nerve contact. All such nerves are bundles, not single fibers. How exterior current affects these nerve bundles during group firing is still not well understood. But empirical tests do show what Doesn't kill!
Missing is discussion on how Long a heart disruption has to continue to prevent it's re-establishment when the exterior current is removed. Mr. Kemmler took 17 sec. of 1000vAC (typical GW Hertz?) and returned to functional vital signs. So they doubled the voltage, and presumably the current. I'll guess a lot of sex E-machine players are both older and in poorer health. Still, we keep coming back to NO Deaths and no recorded ER admittances from existing equipment. I'll also guess most gets used some before people get bored with the new toy and move to other adventures? Theorists discuss, Engineers are Supposed to test. The test results are in. HUGE sample! Case closed.
I suggest you watch the history channel's show "the men who made america"...Tesla invented polyphase AC that we use, Tesla worked for Edison, Edison was enamored of DC (he didn't care about long distance transmission, he thought it would be generated locally), and told Tesla to fly a hike, Tesla went to Westinghouse, who saw merit in it, and backed efforts to use it. JP Morgan , who had backed Edison, forced him out, threatened to destroy westinghouse in a patent battle, got the right to Tesla's AC system and formed GE.
Malcolm is right about why frequency is important with the heart, it disrupts the impulses that control the heart and as a result, the heat can go into fibrillation. When you use a defibrillator, it breaks the fibrillation and returns to a sinus rhythm. If you looked at heart signals on an oscilloscope you would see something quite similar to the sine wave pattern of AC.
Tens units if I remember correctly uses pulsed DC, which in theory shouldn't cause problems with the heart, but it often is hard to predict what it could do if the output of the tens went across the heart. The safest way to play with a tens unit on the chest is to have something with the positive and negatie side together, so the current travels only a short distance locally (and if dual channel, i.e one on one nipple, one on the other, they don't share a common ground).
The real answer is if you don't know, do the research and find out before trying electrical, non static toys above the heart. There are varying levels of risk, a tens unit with pulse dc is probably low risk to disrupt the heart, but it could. I was part of a rescue squad when a worker got a relatively low level shock from a DC power unit at a lab workstation but it caused him for some reason to have his heart defib, it was probably a combination of the guy having a weak heart and a freak accidents, but you never know. I am not an EE, but I grew up in a family with several in it, and learned a healthy respect for any kind of power.
The reason they chose AC is long distance transmission of DC power at the time would have been difficult, AC is a lot easier to transmit via high tension and stepping it up/down is a lot easier (DC has advantages of simplicity, you can do things are relatively lower voltages, with DC you can control motor speed with a simple rheostat, among other things). DC if I remember correctly has larger power losses over distance.....
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