LifeSource UB-521 Manuel d'utilisateur télécharger pdf (Page 14)

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What Is Blood Pressure?

Blood pressure is the force exerted by blood against the walls of the

arteries. Systolic pressure occurs when the heart contracts; diastolic

pressure occurs when the heart expands. Blood pressure is measured in

millimeters of mercury (mmHg).

What Affects Blood Pressure?

Blood pressure is affected by many factors: age, weight, time of day,

activity level, climate, altitude and season. Certain activities can signifi-

cantly alter one’s blood pressure. Walking can raise systolic pressure by

12 mmHg and diastolic pressure by 5.5 mmHg. Sleeping can decrease

systolic blood pressure by as much as 10 mmHg. Taking your blood

pressure repeatedly without waiting an interval of 5 minutes between

readings, or without raising your arm to allow blood to flow back to the

heart, can also affect it.

In addition to these factors, beverages containing caffeine or alcohol,

certain medications, emotional stress and even tight-fitting clothes can

make a difference in the readings.

What Causes Variations In Blood Pressure?

An individual’s blood pressure varies greatly from day to day and season

to season. For hypersensitive individuals, these variations are even more

pronounced. Normally, blood pressure rises during work or play and falls

to its lowest levels during sleep.

ABOUT BLOOD PRESSURE

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LifeSource UB-521 Manuel d'utilisateur Page 14