It is called an ECG,,could be classified as TORTURE,in my opinion.They put all these electrical terminals on your back and legs,and send all these shocks into your leg and feet nerves,checking for nerve action.....End result is after they checked me in the places I have been having back pain and numbness,each and every one of these pain producing areas WOKE UP,JUST SHREIKING IN PAIN ,but these areas had to be checked to determine the amount of nerve activity.End result,was a feeling like a runaway garbage truck took aim at me......Strange thing is,the guy running the show asked me if I had been diagnosed with polio as a child,and I said no...?.I will be sure to ask my back Dr. next week about that question......