Investigators sought to compare the 24-hour ambulatory cardiovascular data from space with similar data collected in heart failure patients on the ground. This indicates to what degree gravity plays a role in mechanisms of heart failure.
The Card investigation monitored eight male astronauts and found a decrease in their 24-hour awake blood pressure that was equal to a low dose of anti-hypertensive medication. Researchers also found a 30 percent increase in cardiac output and a 30 percent decrease in resistance to blood flow through peripheral blood vessels. It seems three to six months of space flight expands the blood vessels and lowers blood pressure which is good for hypertensive space travelers. Researchers also observed unchanged levels of activity of sympathetic motor nerves.
|Mission||Launch/Start Date||Landing/End Date||Duration|
|Expedition 14||09/18/2006||04/21/2007||215 days|
|Expedition 19||03/26/2009||10/11/2009||199 days|
|Expedition 20||05/27/2009||10/11/2009||137 days|
|Expedition 21||10/11/2009||12/01/2009||51 days|
|Expedition 22||11/30/2009||03/18/2010||109 days|
|Expedition 25||09/24/2010||11/25/2010||31 days|
|Expedition 26||11/26/2010||03/16/2011||111 days|
|Expedition 27||03/14/2011||05/23/2011||70 days|
|Expedition 30||11/14/2011||04/27/2012||166 days|
|Expedition 31||04/27/2012||07/01/2012||65 days|
|Expedition 32||07/01/2012||09/16/2012||78 days|