Scand J Work Environ Health

ObjectivesShift work, such as alternating day and nights, causes chronobiologic disruptions which may cause an increase in hypertension risk. However, the relative contributions of the components of shift work - such as shift type (eg, night work) and rotations (ie, switching of shift times; day to night) - on this association are not clear. To address this question, we constructed novel definitions of night work and rotational work and assessed their associations with risk of incident hypertension.MethodsA cohort of 2151 workers at eight aluminum manufacturing facilities previously studied for cardiovascular disease was followed from 2003 through 2013 for incident hypertension, as defined by ICD-9 insurance claims codes. Detailed time-registry data was used to classify each worker\u2019s history of rotational and night work. The associations between recent rotational work and night work in the last 12 months and incident hypertension were estimated using adjusted Cox proportional hazards models.ResultsElevated hazard ratios (HR) were observed for all levels of recent night work (>0\u20135, >5\u201350, >50\u201395, >95\u2013100%) compared with non-night workers, and among all levels of rotational work (10\u201320, >20\u201330, and >30%) compared with those working