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Relationship between social jet lag and diabetes markers in overweight night workers


Night shift work promotes chronic discrepancy between social and biological clocks defined as social jetlag, which has been associated with an increased risk of developing type 2 diabetes.


To evaluate the association between social jetlag and parameters of diabetes control (HbA1c, glycemia and insulin) among overweight night workers.


We performed a double-blind randomized clinical crossover Trial. The present study used only data extracted from the baseline with 43 female overweight night workers of the nursing team at a large hospital in São Paulo/SP. Parameters of diabetes control were assessed from a single 12 hour fasting blood sample. Social jetlag was quantified through the Munich Chronotype Questionnaire (MCTQshift).


The mean age of participants was 39.8 years (SD=6.3 years). Most of them were nursing technicians (51.2%) and married (65.1%). The mean time in the current night shift was 5.6 years (SD=3.8 years) and the mean social jetlag was 3:52h (SD=1:25h). There was no difference in proportions of the parameters of diabetes control according to social jetlag. Similarly, there was no association between social jetlag and HbA1 (2nd tertile OR=0.35, 95%CI 0.11-1.10), nor blood glucose (2nd tertile OR=0.47, 95%CI 0.18-1.23, 3rd tertile OR=1.06, 95%CI 0.38-2.94). Insulin modeling could not be performed due to the small number of participants with inadequate levels of this parameter.


Although the participants experienced high levels (>2 hours) of social jetlag, it was not associated with the parameters of diabetes control. It is noteworthy that more studies are needed to understand what effects social jet lag can have on metabolic disorders in night workers.


Social jet lag, Diabetes markers, Night work, Melatonin supplementation.


Área Clínica


1Department of Epidemiology, Public Health Graduate Program, Catholic University of Santos - Sao Paulo - Brasil, 2Department of Health, Life Cycles and Society, School of Public Health, University of São Paulo - Sao Paulo - Brasil, 3Stress Research Institute, University of Stockholm, Sweden - - Suécia


Adriana Sousa Duarte, Ananda Lais Felix Garrido, Gabriella Habib Rodrigues, Patricia Texeira Santana, Luciana Fidalgo Ramos Nogueira, Pollyanna Pellegrino, José Cipolla-Neto, Claudia Roberta Castro Moreno, Elaine Cristina Marqueze