Study: Workers in High Strain Jobs Have Higher Blood Pressure Than Less Stressed Employees

EMPLOYEES reporting high levels of job strain have higher blood pressure than less stressed workers, according to a study in the April Journal of Occupational and Environmental Medicine, official publication of the American College of Occupational and Environmental Medicine (ACOEM).

The research, led by Els Clays, M.Sc., of Ghent University, Belgium, found that high job strain -- defined as high psychological demands combined with low control or decision-making ability over one's job -- is associated with increased blood pressure particularly among men not just during the work day but also at home and during sleep.

Using data from a large study of the health effects of job stress, the researchers identified 89 middle-aged Belgian workers with high job strain and a similar number of workers without high job strain. Both groups underwent 24-hour ambulatory blood pressure monitoring, in which their blood pressure was measured at frequent intervals as they went through their regular daily activities.

The study found that men with high job strain had significantly higher blood pressure. Although blood pressures were highest at work, workers with high job strain also had increased blood pressure while they were at home, and even when they were sleeping.

Workers with high job strain had increased rates of other risk factors, such as increased body weight and smoking. However, the relationship between job strain and blood pressure remained significant after adjustment for these factors.

Detailed analysis suggested that the rise in blood pressure was more strongly related to low job control, or "decision latitude," than to high job demands.

High job strain has previously been linked to an increased risk of cardiovascular disease, particularly in men. Increased blood pressure is one way in which high job strain might affect cardiovascular risk.

"Based on this and other studies, there is convincing evidence for consistent associations between self-perceived job strain and ambulatory blood pressure," the researchers concluded.

The increases in blood pressure linked to high job strain may not seem large on the individual level. However, from a public health perspective they could be very significant -- especially since blood pressure reductions of similar magnitude can lead to substantial reductions in heart disease risk.

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