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The low point is referred to as diastole and occurs when the ventricles relax and minimal pressure is exerted against the vessel wall. A normal blood pressure for a healthy adult ranges from 90 to 120 mm Hg systolic and from 60 to 80 mm Hg diastolic. Under normal circumstances, blood volume remains constant at 5,000 mL.
A blood pressure measurement includes two numbers: systolic pressure (the upper number) and diastolic pressure (the lower number). These numbers are measured in millimeters of mercury, or mmHg. Your systolic pressure is high: 140 mmHg or over is high. And your lower number is normal: normal diastolic pressure is below 80 mmHg. When your systolic blood pressure is high and your diastolic blood pressure is low, itâs called isolated systolic hypertension (ISH). People with ISH do benefit from treatment, as it lowers the risk of heart disease and stroke.