• 6 Petitioner highlights her acts at work on July 8, 1980, including lifting 8 1/2- by 14- by 4-inch ledger books from the bookshelf behind her desk, and similar books from a safe 15 feet away from her desk. There is no evidence that these, or any other, physical acts which petitioner engaged in at work constituted more strenuous or stressful activities than the type of acts required in normal daily activities. Cf. Northern Illinois Gas Co. v. Industrial Comm'n (1986), 148 Ill. App.3d 48, 498 N.E.2d 327 (causal connection found where employee was digging hole in ground for over one hour prior to heart attack); Board of Education v. Industrial Comm'n (1986), 146 Ill. App.3d 937, 497 N.E.2d 447 (causal connection found where employee helped carry 200-pound desk minutes before heart attack); Old Ben Coal Co. v. Industrial Comm'n (1986), 141 Ill. App.3d 78, 489 N.E.2d 1159 (causal connection found where first cardiac symptoms appeared after strenuous, unusual exertion in fighting a fire at work for 30 minutes). Petitioner also points out that she was under emotional stress due to the pressure of preparing the commission checks for the salesmen.