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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.
The 1st Number: Systolic pressure is the blood pressure when the heart muscle contracts. The 2nd Number: Diastolic pressure is the blood pressure when the heart is relaxed. The BP numbers shown in the chart represent Typical systolic-diastolic pairs. There are many non-typical systolic/diastolic pairs, which I have analyzed statistically at Systolic-Diastolic Pairs.