Effects of work hours and lifestyle on metabolic and reproductive facets of a Brazilian population (Bauru, Sao Paulo,Brazil)
Abstract
Circadian rhythms can be defined as changes in physiological and behavioral events within a 24 hours period. The aim of the present study was to evaluate how changes to circadian rhythms in shift workers contribute to the development and the prevalence of metabolic disorders, such as diabetes, hypertension, obesity when associated with factors such as gender, age, and smoking and eating habits. This study also considers the influence of these factors on individual fertility. The study was performed by analyzing data collected in a survey. The survey was answered by a population of 600 individuals of both genders in the city of Bauru, São Paulo State, Brazil. Individuals of both genders were grouped in three different age categories: 20-35 years old; 36-59 years old; and 60 years old and older. Each age/gender category contained one hundred individuals (n= 600; 45 men and 12 women were shift workers, and 255 men and 288 women worked regular business hours). Our results showed no changes in the factors considered (incidence of diabetes, hypertension, and obesity) among younger shift workers (20-35 years old) of either gender in our population. Shift-working women in the “36-59 years old” category presented a high incidence of hypertension, and this hypertension was associated with poor diet and smoking habits. Shift-working men in the “60 years old and older” category presented high incidences of diabetes, hypertension, and obesity; all of these factors were associated with smoking habits. In conclusion, our datashowed the effect of the extent of circadian rhythm disruption on the prevalence of metabolic syndrome. We also found that women seem to suffer the effects of the circadian rhythm disruption earlier in life than men. Fertility data were not conclusive in our study.
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