Evaluation of some cardiovascular risk parameters in health professionals exposed to night work.

Shift work and night work in particular represent a risk factor for the health of exposed workers; aim of our study is to evaluate whether night work may cause alteration of some cardiovascular risk parameters in health workers. The research was carried out on 415 health workers, 163 exposed to night work and 252 not exposed. A blood sample was taken from each worker, between 8.00 a.m. and 10.00 a.m. before lunch time, to test total cholesterol, HDL cholesterol, and triglycerides. Blood pressure and heart rate were also measured. Workers with cardiovascular diseases, thyroid diseases, diabetes mellitus, dyslipidemia, those who made use of antihypertensive drugs, hypoglycemic and/or lipid-lowering drugs, subjects with body mass index (BMI) (kg/m2) higher than 30 were excluded. In the group of exposed compared to controls, increasing values of arterial pressure and heart rate, were not significant. The mean values of total cholesterol and triglycerides were significantly higher in exposed compared to controls while values of HDL cholesterol were significantly lower. Night workers have clinically significant changes in blood levels of total cholesterol, HDL cholesterol and triglycerides, such alterations are presumably related to poor food hygiene and to psychosocial stressors.