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The relationship between serum creatine phosphokinase (CPK) activity and labor strength was examined. Our epidemiological study showed thar the serum CPK activity in a group of men who worked over ten hours was significantly higher than that in the other groups who worked less than ten hours. In women, the serum CPK activity in a group who worked over seven hours was significantly higher than that in the other groups. The serum CPK activity in fishermen was significantly higher than that indoi:10.2185/jjrm.41.1033 fatcat:zijqk4zhkjd5zjp5skj53gwa2i