[Orthostatic adaptation of blood pressure and pulse rate in children].
Reactivity of blood pressure (BP) and heart rate (HR) to active orthostasis was studied in 1540 children aged 3-7 years. After changing the position from supine to sitting all cardiovascular parameters studied increased significantly. The recorded mean increases were as follows: systolic BP-3-7 Torr, diastolic BP-2 Torr, HR-5-7 beats min-1, pulse pressure 3-6 Torr, mean BP-2-3 Torr. The change to erect position induced a further increase. The reactive increments were in negative correlation with the initial values (r = -0.3, p < 0.001) in both sexes. The incidence of responses with a higher amplitude was significantly higher in children from the lower quartiles of supinal BP distribution. The incidence of reactive BP drop increased gradually from 7 to 14% of cases.
Regecová
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Ustav normálnej a patologickej fyziológie SAV, Bratislava, CSFR.
D000222:Adaptation, Physiological; D001794:Blood Pressure / Q000502:physiology*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D011187:Posture / Q000502:physiology*; D011674:Pulse / Q000502:physiology*