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Diastolic blood pressure measures the pressure in your blood vessels between heartbeats, when your heart is resting. It is represented by the bottom number in a blood pressure reading. Systolic blood pressure measures the amount of pressure that blood exerts on vessels while the heart is beating.
A blood pressure reading has two numbers: a systolic blood pressure and a diastolic blood pressure. The systolic blood pressure is the maximum pressure the blood exerts on the vessels when the heart is beating. The diastolic blood pressure is the pressure the blood exerts on the vessels in between heartbeats. Hypertension, or high blood pressure, begins when the systolic blood pressure remains above 140 or when the diastolic blood pressure remains above 90.