The aim of our study is to research the relationships among temperature, glucose concentration, and viscosity of blood and plasma, and to calculate their effects on blood pressure (BP) according to Hagen-Poiseuille's hydrodynamics equation. Viscosity, hyperglycemia, circulatory load, blood pressure, temperature Am J Hypertens 2001 14:433–438 © 2001 American Journal of Hypertension, Ltd. Consequently, temperature, glucose and viscosity levels of blood are important factors for BP. In this state, blood flow rate decrease was 20% and BP increase for physiological compensation was 25%. When the mean value of blood glucose increased from 100 to 400 mg/dL, viscosity increased 25% (r = 0.59, P =. There is a correlation between total data for temperatures and viscosities (r = −0.84, P <. Erythrocyte deformability increase of 9.92% and plasma viscosity decrease of 4.99% arose from the temperature rise. This caused 11.15% decrease in blood flow rate, and 11.15% decrease in BP, according to the equation. When temperature increased from 36.5° to 39.5☌, blood viscosity decreased 10.38%. Also, a 34.73% decrease in erythrocyte deformability and 18.71% increase in plasma viscosity were seen. According to the Hagen-Poiseuille equation, the required BP increase for compensation of the resulting tissue ischemia was 20.72%. This increase resulted in a 20.72% decrease in blood flow rate. When temperature decreased from 36.5☌ to 22☌, blood viscosity increased 26.13%. Statistical evaluations of the data were made with regression analysis, Student t test, Spearman's correlation, and analysis of variance. Parameters were determined with capillary viscometer and glucometer at 22☌, 36.5☌, and 39.5☌ in healthy subjects, and at 22☌ on diabetic patients during OGTT with 75 g of glucose. With simple random sampling method, 53 healthy and 29 diabetes mellitus (DM) type II subjects were selected. We planned a study to research the relations among blood pressure (BP), viscosity, and temperature in healthy subjects and among BP, viscosity, and glucose in diabetics.
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