Citizen Systems CH-432BS instruction manual About Blood Pressure, What is blood pressure?

ABOUT “BLOOD PRESSURE”

What is blood pressure?

The heart is a pump that circulates blood throughout your body. Blood is pumped from the heart at a constant pressure into arteries. This pressure is called the arterial blood pressure and represents, in general terms, your blood pressure. Blood pressure is indicated by several kinds of pressures, including the systolic pressure that occurs when the heart pumps blood, and the diastolic pressure that occurs when blood returns to the heart.

(Systolic)

Artery

Left atrium

Left

ventricle The artery wall expands.

Contraction

(Diastolic)

	Artery
Left atrium
Left	Normal state is restored
ventricle	to the artery wall.
	Dilation

English

Your blood pressure changes all the time.

Your blood pressure differs according to your age, gender and a range of other factors. It is likely to be affected by your biorhythm during the day and by your posture, physical activities, mental activities, level of stress and even by the air temperature. The blood pressure of a healthy person generally varies within a day.

[Example of blood pressure variations within a day]																						Systolic blood
(mmHg)	160																						pressure
	140
	120
value
	100
pressure	80
	60																					Diastolic blood
Blood	40
																			Sleeping				pressure
	12	13	14	15	16	17	18	19	20	21	22	23	24	1	2	3	4	5	6	7	8	9	10	11

Time of day

(Blood pressure values measured at five-minute intervals through the day)

●Bevan AT, Honour AJ, Stott FH. Clin Sci 1969;36:329–44.

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