EE RECEIVED SHOCK AFTER UNHOOKING A THUMPER FROM FINDING A GROUND IN MINER CABLE. HE SAID HE FLIPPED TOGGLE SWITCH OFF, DEPRESSED ACTIVATOR WHEN HE FELT A SHOCK. HE WAS TAKEN TO HOSPITAL WHERE SEVERAL TEST WERE PERFORMED. UPON INVESTIGATION THE THUMPER KNOB WAS FOUND ON HIGH. THIS REPORT IS FILED DUE TO AN MSHA VIOLATION. MANAGEMENT BELIEVES A MEDICAL CONDITION KEPT EE FROM WORK.