Aging changes in vital signs

Blood pressure - aging changes; Breathing rate - aging changes; Temperature - aging changes

The vital signs include body temperature, pulse (heart rate), respiratory rate (breathing), and blood pressure. The normal vital sign values change with aging.

AGING CHANGES

Normal body temperature does not change significantly with aging. Temperature regulation, however, is more difficult.

Because of changes in the heart, the resting heart rate may become slightly slower. It takes longer for the pulse to speed up when exercising, and longer to slow back down after exercise. The maximum heart rate reached with exercise is lowered.

Blood vessels become less elastic. The average blood pressure increases from 120/70 mm Hg to about 150/90 mm Hg and may remain slightly high even if treated. The blood vessels also respond more slowly to a change in body position.

Although lung function decreases slightly, changes are usually only in the reserve function. The rate of breathing usually does not change.

EFFECT OF CHANGES

Loss of subcutaneous fat makes it harder to maintain body heat. Many older people find that they need to wear layers of clothing in order to feel warm. Likewise, skin changes include the reduced ability to sweat. Therefore, older people find it more difficult to tell when they are becoming overheated.

There may be decreased tolerance to exercise. Some elderly people have a reduced response to decreased oxygen or increased carbon dioxide levels (the rate and depth of breathing does not increase as it should).

Many older people find that they become dizzy if they stand up too suddenly. This is caused by a drop in blood pressure when they stand called orthostatic hypotension.

Medications that are used to treat common disorders in the elderly may also have a profound effect on the vital signs.

For example, digitalis (used for heart failure) and certain blood pressure medications called beta blockers may cause the pulse to slow. Pain medications can slow breathing. Diuretics can cause low blood pressure and aggravate orthostatic hypotension (a drop in blood pressure when changing body position).