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Normally during exercise, blood pressure increases to push the flow of oxygen-rich blood throughout the body. However, in some individuals, the response to exercise is exaggerated. Instead of reaching a systolic (upper number) blood pressure of around 200 mmHg at maximal exercise, they spike at 250 mmHg or higher.
The higher number, or the systolic, is the pressure in the area measured when the heart beats or contracts, and the lower number, or diastolic, is the pressure when the heart relaxes after the heartbeat. Blood pressure changes throughout the day. When a person is exercising or under stress, it can go up. When someone is relaxing, it can go down. Similarly. blood pressure can vary when a person is lying in bed, sitting or standing.