Normal, or average, blood pressure is usually thought to be around 120/80 mm Hg. A person is not considered to have borderline hypertension until the values reach exceed 140/90 mm Hg.
ACSM defines diagnosed hypertension as systolic blood pressure greater than 140, and/or diastolic blood pressure greater than 90 mm Hg, on at least two separate occasions, or if the individual is on high blood pressure medication.
The top number, or higher value, is referred to as the systolic pressure, or the amount of pressure of force exerted against the arterial walls immediately after the heart has contracted.
The bottom number or diastolic pressure, may be thought of as the "run off" force, or the amount of pressure still remaining against the arterial walls as the heart relaxes before the next contraction.
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