Cardiovascular Risk Prevention Among Night Workers

With around 15 to 20% of workforce engaging in nightshift work in modern society for obvious economic and social reasons, the consequences of night work on cardiovascular risks are substantial. Compared to day workers, it was reported higher risks of cardiovascular diseases (estimated at 40%) and of metabolic syndrome (1.5 times) in shift workers. The occurrence of metabolic syndrome increases the risk to develop high blood pressure, diabetes and cardiovascular events. Because some characteristics of night work are potentially modifiable, some preventive strategies could be applied to reduce its adverse effects. For shift workers, some recent guidelines (High Health Authority, 2012 \& 2016) and fruitful literature propose to develop regular assessments of cardiovascular risk factors and occupational activities, and stress the need to expand preventive strategies. Moreover, some recent French laws provide an opportunity to implement preventive interventions and specific monitoring through the occupational physicians network. However, whether the concept is defined, the exact content, method and the potential benefits are unknown. The investigator assume that individual advice related to collective countermeasures referenced on guidelines (applied on worksite within plant) could lead a better improvement on incidence of metabolic syndrome compared to those that benefit only individual advice. Main objective: To measure the benefit from implementation of individual and collective prevention (dispensed in worksites within plants) on metabolic syndrome compared to strategy relying only on individual prevention among night workers, over 2 years\' follow-up. The secondary objectives of the study are to evaluate in both groups: 1. Observance of different types of preventive strategies 2. Impact of observance of preventive advice on metabolic syndrome in shift workers and on each component of metabolic syndrome 3. Determinants which promote the up-take of preventive strategies among night workers 4. The countermeasures which could be applied and effective within company 5) Medico-economic assessment is planned from an ancillary study.