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[Evaluation of blood pressure changes and heart rate in young health men based on results of a 24-hour monitoring of pressure].

Systolic and diastolic blood pressures and heart rate were monitored in a group of 20 young healthy men for 24 hours. Period of time between 8 o'clock a.m. and 10 o'clock p.m. was treated as waking state whereas period of time from 12 p.m. to 6 a.m. as sleep phase. Mean value of systolic blood pressure for waking state was 124.6 +/- 7.6 mm Hg, and for sleep phase 110.4 +/- 11.5 mm Hg. (p < .001). Mean diastolic blood pressures were also significantly different (76.5 +/- 5.9 mm Hg and 63.8 +/- 7.7 mm Hg, respectively), the same concerns heart rate (79.6 +/- 6.4 and 63.0-7.2 min-1, respectively). In both cases p < .001. To evaluate dependence of heart rate on systolic blood pressure in waking state the following calculation was made: HR = 0.230 x systolic blood pressure +51.4 (r = 0.24; p < .001) whereas for sleep phase r did not reach a level of statistical significance (HR = 0.074 x systolic blood pressure + 53.9; r = 0.094). Single or even multiple measurements of the arterial blood pressure are not sufficient to evaluate circadian changes.