When women arrived at their clinic complaining of angina (heart disease related chest pain) while vacuuming, University of Nebraska researchers decided to examine the phenomenon. In a study of 36 healthy women ages 50 to 59, the scientists found that vacuuming was indeed a taxing task, but how much it stressed the heart depended on the model. The easiest to use: self-propelled upright cleaners, best for women with heart disease.