Cardiovascular Responses to Mild Lower Body Negative Pressure during Spaceflight.

These data suggest that the cardiovascular system can accommodate up to 60 min of sustained use of mild levels of LBNP during long-duration spaceflight. There was a single report of mild hypotensive symptoms during use of LBNP by an individual who had low blood pressure prior to the start of the LBNP session. Thus, the absolute arterial blood pressure should be taken into consideration when determining if an LBNP session will be a potential challenge to the cardiovascular system during spaceflight.