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The Contributions of Abdominal and Leg Compartments to the Cardiovascular Response to Lower Body Negative Pressure (LBNP),
FLYING PERSONNEL RESEARCH COMMITTEE LONDON (ENGLAND)
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The contributions made by the abdomen and the legs to the overall response to lower body negative pressure were evaluated separately, using a specially designed box. Heart rate, forearm blood flow, oesophageal pressure and right heart filling pressure were measured in 5 subjects during 5 min exposures to pressures of -30, -60 and -90 torr applied either to the legs, to the abdomen, or to both compartments together. In addition, cardiac output, stroke volume, central blood volume, systemic arterial pressure and systemic vascular resistance were measured in two of the subjects during similar exposures to LBNP. With the exception of changes in oesophageal pressure, leg suction had a significantly greater effect than abdominal suction, and combined suction was generally additive.
APPROVED FOR PUBLIC RELEASE