Blood pressure is not significantly lowered during vigorous exercise. During vigorous exercise such as five miles of jogging or 20 minutes of continuous aerobic exercise, the systolic blood pressure increases markedly in most individ¬uals. In many, the rise in blood pressure is substantial and it is possible that damage can occur in arteries during vigorous exercise. For example, a 40-year-old with a normal systolic blood pressure of 130 mmHg while running one to two miles, will usually have an increase in blood pressure during the run to about 150–180 mmHg. There is usually no increase in the diastolic blood pressure except in patients who have hypertension. Blood pressure rapidly falls on cessation of exercise and returns to the normal resting level within a few minutes.
Individuals with mild hypertension who engage in a regular exercise program may obtain a slight reduction in their resting blood pressure, and this is believed to be due to a combination of factors including weight loss and relaxation. Therefore, indirectly, regular exercises are important to assist with weight reduction, thereby lower¬ing blood pressure in individuals with mild hyperten¬sion. If you have moderate or severe hypertension, do not depend on exercise; it will not reduce blood pressure and can cause an increase in existing high blood pressure during vigorous exercise.

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