EE WAS MOVING MINER CABLE TO MOVE THE MINER FROM #3 ENTRY TO THE #6 FACE. HE FELT DISCOMFORT IN HIS BACK AFTER DOING THIS TASK. ANOTHER EE WAS HELPING HIM. LATER THAT DAY EE WALKED THE PRIMARY ESCAPEWAY ROUTE OUT OF THE UNIT TO THE BOTTOM, AS PART OF ESCAPEWAY DRILL. THIS ALSO AGGRAVATED HIS BACK. EE CONT. TO WORK - 1ST DAY MISSED: 5/7/04. REMOVED FROM DUTIES BY DOCTOR.