A study by the University of Kansas found that firefighters are more likely to have prematurely narrowed arteries, which increases their risk for strokes and heart attacks. The data shows that 22 percent of a group of 77 firefighters studied by researchers at the University of Kansas averaged 39 years old but had the blood vessels of 52-year-olds because of significant plaque buildup in their carotid arteries.
The researchers said the reasons could include stress, exposure to smoke, diet, and their sleep patterns.
Cardiovascular disease has been associated with 45 percent of the on-duty deaths of firefighters in the United States, compared with 36 percent for other lines of work. The National Institute for Occupational Safety and Health has reported that sudden cardiac deaths are the leading cause of death in the line of duty for firefighters.