Relationships Between Variation Of Nocturnal Dipping Blood Pressure And Chronotypes

A Chronobiology, a science that studies the temporal organization of living beings, establishes molecular mechanisms that explain the rhythmicity observed in organisms. Between the rhythmic variations observed is blood pressure, which shows a morning rise and nocturnal dipping, the latter being important in predicting cardiovascular risk. The individuals can also be chronophenotypically classified according to their daily preferences, in morningness-eveningness. Objectives: To verify the hypothesis of a relationship between the morning chronotype and the nondipper night pressure profile. Methodology: Descriptive cross-sectional study, with the realization of the noninvasive ambulatory monitoring of blood pressure to obtain the pressure curve and answer the questionnaire of Ostberg's personal preferences. Results: The survey included twenty participants, from nine were classified as dipper and eleven as nondipper; in addition, twelve were classified as morning and eight as non-morning. The hypothesis test revealed statistical significance in the relationship between morning chronotype and nocturnal non-descent pattern of blood pressure (p = 0.0493), confirming the initial hypothesis, which implies greater risk cardiovascular to this population. Conclusion: The relationship between morning and morning non-nocturnal blood pressure decrease, and further studies are needed to better characterizing this relationship.