Final answer:
A systolic blood pressure reading below 100 mm Hg is known as hypotension, and maintaining lower normal systolic pressure is beneficial for cardiovascular health. Chronically high systolic pressures can lead to a condition called hypertension.
Step-by-step explanation:
A systolic blood pressure reading below 100 mm Hg is called hypotension. In the circulatory system, pressure is minimum during diastole, known as diastolic pressure, which ideally should be less than 80 mm Hg. The systolic pressure, measured during ventricular contraction, or systole, is expected to be around 120 mm Hg for a healthy individual. Studies have indicated that maintaining a systolic pressure on the lower end of the normal range, such as around 115 mm Hg, can lead to better long-term cardiovascular health. Conversely, chronically elevated systolic pressure above 140 mm Hg is a condition called hypertension, which can lead to serious health issues such as stroke, heart attack, and other cardiovascular diseases.