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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.
Systolic blood pressure is the top number when reading blood pressure levels, and generally doctors recommend it be below 140. End-diastolic volume is the amount of blood left in the heart, or specific ventricle, when the relaxation phase is completed. Diastolic pressure is the resting force of blood within blood vessels. A blood pressure reading measures both the systolic and diastolic pressures.