Skip to page content Mission Information


24-Hour Pattern of Blood Pressure and Heart Rate in Weightlessness (Circa)
Research Area:
Cardiovascular physiology
Species Studied
Scientific Name: Homo sapiens Species: Human

The objecitve of this experiment is to measure the pattern of blood pressure and heart rate during a 24-hr period in astronauts. The combined data from two instruments used in this experiment enabled the team to unravel the underlying physiology of circadian cardiovascular control in weightlessness. The experiment did so by taking repeated automatic measurements of upper arm cuff pressure with the Bloodpressure Measurement Instrument, continuous measurements of finger blood pressure with the Portapres hardware, and heart rate.

++ -- View more

Karemaker JM, Berecki-Gisolf J. 24-h Blood Pressure in Space: The Dark Side of Being an Astronaut. Respiratory Physiology & Neurobiology. 2009; 169 Suppl: S55-S58. [}

Adaptation, physiological
Blood pressure
Heart rate
Stress, psychological
Vascular resistance

Data Information
Data Availability
Archive is complete. No data sets are available for this experiment. Please Contact LSDA if you know of available data for this investigation.

Blood pressure
Heart rate

Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
Expedition 8 10/18/2003 04/29/2004 195 days
Expedition 9 04/18/2004 10/23/2004 188 days

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Johnson Space Center LSDA Office
Project Manager: Pamela A. Bieri
Institutional Support
European Space Agency (ESA)