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Meanwhile, heart stress is based on pulse pressure.

The study also found that high pulse pressure -- pulse pressure is the difference between the top and bottom numbers in a blood pressure reading -- increased the risk of an accident.

A number of characteristics common to truck driving -- such as stress, long hours, heavy lifting, and lack of sleep and exercise -- could contribute to fatigue and high pulse pressure, the researchers said.

They also noted that a high pulse pressure is a possible sign of heart disease.

In general, pulse pressure increases with age and is a predictor of heart disease.