SUPERVISOR WAS ADJUSTING A BOTTOM ROLLER IN STAND WHEN HE PULLED A MUSCLE IN HIS NECK. CAUSE OF INJURY WAS IMPROPER LIFTING. COMPLIANCE WITH RULES/REGS WAS NOT A FACTOR, PROTECTIVE EQUIP NOT A FACTOR, MINER PROFICIENCY A FACTOR, MINING EQUIP AND SYSTEMS A FACTOR. DID NOT SEEK MEDICAL TREATMENT UNTIL 3-7-2001.