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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.
During aerobic, upright exercise, such as walking, people will experience an increase in systolic blood pressure and a slight decrease in diastolic blood pressure. Systolic blood pressure increases to improve blood flow, which is necessary to provide higher levels of oxygen to working muscles.lood pressure readings consider two numbers: systolic and diastolic pressure. Systolic blood pressure is the pressure in the arteries when the heart beats, while diastolic blood pressure is the pressure in the arteries between heartbeats when the heart is resting and refilling with blood.