NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Astronaut testing low pressure device. Canadian astronaut Dafydd R. Williams (bottom) acts as a test subject for the Lower Body Negative Pressure device (LBNP) in the Neurolab onboard space shuttle Columbia during mission STS-90 (17th April - 3rd May 1998). Assisting him are US astronauts Jay C. Buckey Jr. James A. Pawelczyk. The LBNP device consists of a large bag, which is sealed around the waist of the user, and evacuated to form a partial vacuum. The pressure is usually around a tenth of that found on Earth. By having to work against reduced pressure, blood flow around the body more closely resembles that on Earth, reducing the muscle atrophy which usually occurs in microgravity. Photographed on 23rd April 1998.
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