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Orthostatic intolerance

Orthostatic intolerance is the failure of the body to properly adjust to an upright position, especially with respect to blood flow, heart rate, and blood pressure.

A common manifestation of chronic orthostatic intolerance is postural orthostatic tachycardia syndrome.

The loss of orthostatic tolerance is also an undesirable consequence of human adaptation to space and has often been emulated in head-down bed rest studies.

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Stand up for science - Science News of the year: the weekly newsmagazine of science - how astronaut experiences may help orthostatic intolerance - Brief
From Science News, 12/21/02

Understanding the dizziness that astronauts often feel after space flight may help explain orthostatic intolerance, a disorder in which patients get faint or dizzy while standing. Here, one astronaut monitors a test in which another astronaut (foreground, beneath tubes)lies in a device that produces negative pressure on the lower half of his body, mimicking the effects of gravity on blood flow. (161:376).

COPYRIGHT 2002 Science Service, Inc.
COPYRIGHT 2003 Gale Group

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